tests: speed up builds with single-binary test bundles

Add support for single-block binaries that contain all libtests and
unit tests respectively.

Enable with:
- autotools:

tests: speed up builds with single-binary test bundles

Add support for single-block binaries that contain all libtests and
unit tests respectively.

Enable with:
- autotools: `--enable-test-bundles`
- cmake: `-DCURL_TEST_BUNDLES=ON`

(They are compatible with `--enable-unity` and `-DCMAKE_UNITY_BUILD=ON`
options, for further speed-up.)

Makes libtests and unit tests build _fast_, needing little disk space
even in static mode. Similar to CMake unity mode, but with a custom
script, also supporting autotools builds.

The price is having to deal with symbols/macros colliding between
`lib*.c` and `unit*.c` sources. Maybe with naming conventions or other
solutions this can be improved gradually and reduce the need for manual
intervention by `mk-bundle.mk`. I've included a script that does the bulk
of detecting name collisions.

Also:
- CI: enable test bundles.
- CI: build tests in more jobs.
- lib2305: fix FILE handle leak.
- unit1661: fix memleak found by torture test by releasing the `bufref`
structure in `unit_stop()` that was allocated in `unit_setup()`.
```
test 1661...[bufref unit tests]
Leak detected: memory still allocated: 13 bytes
allocated by /home/runner/work/curl/curl/tests/unit/unit1661.c:70
1661: torture FAILED: function number 1 in test.
```
Ref: https://github.com/curl/curl/actions/runs/10967279334/job/30456745290?pr=14772#step:8:41

Similar test suite builds with autotools default and cmake+bundle+unity:
- GHA/Linux: 33s vs 7s
https://github.com/curl/curl/actions/runs/10705668823/job/29681617374
- GHA/macOS 34s vs 2s
https://github.com/curl/curl/actions/runs/10705668813/job/29681632885
- GHA/FreeBSD: 15m25 vs 6m21 (full workflow time, ~qemu)
https://github.com/curl/curl/actions/runs/10705668811/job/29681607915
- GHA/Cygwin: 9m52 vs 32s
https://github.com/curl/curl/actions/runs/10705668809/job/29681609965
- GHA/MSYS2: 3m52 vs 14s
https://github.com/curl/curl/actions/runs/10705668808/job/29681624295
- GHA/mingw-w64: 5m45 vs 30s
https://github.com/curl/curl/actions/runs/10705668808/job/29681628787

Autotools test suite builds compared between master -> `--enable-test-bundles`:
- GHA/Linux: 33s -> 9s (run tests: 22m23 -> 20m44)
https://github.com/curl/curl/actions/runs/10710030193/job/29695932185
https://github.com/curl/curl/actions/runs/10967831456/job/30458220344
- GHA/macOS: 25s -> 4s (run tests: 2m58 -> 2m24)
https://github.com/curl/curl/actions/runs/10710030195/job/29695938444
https://github.com/curl/curl/actions/runs/10967831452/job/30458225762
- GHA/non-native (FreeBSD): 4m8 -> 3m12 (full workflow time, ~qemu)
https://github.com/curl/curl/actions/runs/10710030198/job/29695928401
https://github.com/curl/curl/actions/runs/10967831458/job/30458212692
- GHA/Cygwin: 9m25 -> 1m9 (run tests: 9m19 -> 3m28)
https://github.com/curl/curl/actions/runs/10710030212/job/29695928213
https://github.com/curl/curl/actions/runs/10967831453/job/30458213268
- GHA/MSYS2: 3m54 -> 32s (run tests: 6m3 -> 3m59)
https://github.com/curl/curl/actions/runs/10710030190/job/29704850591
https://github.com/curl/curl/actions/runs/10967831449/job/30459280005
- GHA/mingw-w64: 5m42 -> 1m5 (run tests: 7m41 -> 5m36)
https://github.com/curl/curl/actions/runs/10710030190/job/29704852058
https://github.com/curl/curl/actions/runs/10967831449/job/30459280862
- Azure MSYS2 mingw64 openssl: 38m55 -> 11m58
https://dev.azure.com/daniel0244/curl/_build/results?buildId=25546&view=logs&j=b58b8c59-0f61-52e9-0f9e-fad562a1e77f&t=0f9230a7-3b10-53ca-9938-700ece377c5e
https://dev.azure.com/daniel0244/curl/_build/results?buildId=25547&view=logs&jobId=39473db1-3945-55d5-deb5-c218fad88dce&j=b58b8c59-0f61-52e9-0f9e-fad562a1e77f&t=0f9230a7-3b10-53ca-9938-700ece377c5e
- Azure Ubuntu default: 2m15 -> 55s (all build)
https://dev.azure.com/daniel0244/curl/_build/results?buildId=25546&view=logs&j=9d58b9ac-e1e6-53b6-f83a-1f9f1d912522&t=a6b38d83-e7cf-5a9b-c762-a178412717b7
https://dev.azure.com/daniel0244/curl/_build/results?buildId=25547&view=logs&jobId=39473db1-3945-55d5-deb5-c218fad88dce&j=9d58b9ac-e1e6-53b6-f83a-1f9f1d912522&t=a6b38d83-e7cf-5a9b-c762-a178412717b7

Cmake test suite builds compared between master -> `-DCURL_TEST_BUNDLES=ON` + unity:
- GHA/Linux: 29s -> 7s (run tests: 4m50 -> 4m57, 20m43 -> 20m45)
https://github.com/curl/curl/actions/runs/10710030193/job/29695941814
https://github.com/curl/curl/actions/runs/10705668823/job/29681622201
- GHA/Linux old: 44s -> 13s (bundle+no unity) (run tests: 5m5 -> 5m6)
https://github.com/curl/curl/actions/runs/10718264094/job/29719794727
https://github.com/curl/curl/actions/runs/10718653175/job/29721009613
- GHA/macOS: 32s -> 2s (run tests: 2m43 -> 2m40)
https://github.com/curl/curl/actions/runs/10710030195/job/29695931956
https://github.com/curl/curl/actions/runs/10705668813/job/29681638937
- GHA/non-native (*BSD): inconclusive (full workflow time, ~qemu)
https://github.com/curl/curl/actions/runs/10710030198
https://github.com/curl/curl/actions/runs/10705668811
- GHA/Cygwin: 3m9 -> 32s
https://github.com/curl/curl/actions/runs/10710030212/job/29695929075
https://github.com/curl/curl/actions/runs/10705668809/job/29681609965
- GHA/MSYS2: 2m24 -> 14s
https://github.com/curl/curl/actions/runs/10710030190/job/29704850996
https://github.com/curl/curl/actions/runs/10705668808/job/29681624295
- GHA/mingw-w64: 3m56 -> 30s (run tests: 4m2 -> 3m52)
https://github.com/curl/curl/actions/runs/10710030190/job/29704852219
https://github.com/curl/curl/actions/runs/10705668808/job/29681631393
- GHA/mingw-w64-old: 7m19 -> 1m44 (run tests: 3m30 -> 2m53)
https://github.com/curl/curl/actions/runs/10710030190/job/29704849763
https://github.com/curl/curl/actions/runs/10705668808/job/29681622329
- GHA/MSVC: 3m22 -> 13s (run tests: 9m43 -> 4m22)
https://github.com/curl/curl/actions/runs/10710030190/job/29704850411
https://github.com/curl/curl/actions/runs/10705668808/job/29681623313
- AppVeyor CI MSVC 2008: 4m3 -> 45s (full build)
- AppVeyor CI MSVC 2010: 2m56 -> 1m8 (full build)
- AppVeyor CI MSVC 2022: 10m19 -> 2m23 (full build)
https://ci.appveyor.com/project/curlorg/curl/builds/50538455
https://ci.appveyor.com/project/curlorg/curl/builds/50536558
- AppVeyor CI total build time: 10m30 (master) -> 6m48 (unity) -> 4m5 (bundle) -> 3m24 (bundle+unity) -> 5m7 (bundle+unity+all jobs building tests)

Closes #14772

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tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues fou

tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues found along the way.

Cherry-picked from #13489
Closes #13600

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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lib: remove support for CURL_DOES_CONVERSIONS

TPF was the only user and support for that was dropped.

Closes #8378

curl.se: new home

Closes #6172

mime: do not perform more than one read in a row

Input buffer filling may delay the data sending if data reads are slow.
To overcome this problem, file and callback data reads do not acc

mime: do not perform more than one read in a row

Input buffer filling may delay the data sending if data reads are slow.
To overcome this problem, file and callback data reads do not accumulate
in buffer anymore. All other data (memory data and mime framing) are
considered as fast and still concatenated in buffer.
As this may highly impact performance in terms of data overhead, an early
end of part data check is added to spare a read call.
When encoding a part's data, an encoder may require more bytes than made
available by a single read. In this case, the above rule does not apply
and reads are performed until the encoder is able to deliver some data.

Tests 643, 644, 645, 650 and 654 have been adapted to the output data
changes, with test data size reduced to avoid the boredom of long lists of
1-byte chunks in verification data.
New test 667 checks mimepost using single-byte read callback with encoder.
New test 668 checks the end of part data early detection.

Fixes #4826
Reported-by: MrdUkk on github

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