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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lib: convert Curl_get_line to use dynbuf

Create the line in a dynbuf. Aborts the reading of the file on
errors. Avoids having to always allocate maximum amount from the
start. Avoids

lib: convert Curl_get_line to use dynbuf

Create the line in a dynbuf. Aborts the reading of the file on
errors. Avoids having to always allocate maximum amount from the
start. Avoids direct malloc.

Closes #12846

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build: always revert `#pragma GCC diagnostic` after use

Before this patch some source files were overriding gcc warning options,
but without restoring them at the end of the file. In CMa

build: always revert `#pragma GCC diagnostic` after use

Before this patch some source files were overriding gcc warning options,
but without restoring them at the end of the file. In CMake UNITY builds
these options spilled over to the remainder of the source code,
effecitvely disabling them for a larger portion of the codebase than
intended.

`#pragma clang diagnostic` didn't have such issue in the codebase.

Reviewed-by: Marcel Raad
Closes #12352

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unit3200: skip testing if function is not present

Fake a successful run since we have no easy mechanism to skip this test
for this advanced condition.

tests: fix bad printf format flags in test code

unit tests: use the unit test infrastructure better

Allow UNITTEST_STOP to return the error code, use the fail & abort
macros to indicate test failure and return success instead of fail

unit tests: use the unit test infrastructure better

Allow UNITTEST_STOP to return the error code, use the fail & abort
macros to indicate test failure and return success instead of fail if
the unit test can't test anything because of missing features at
compile-time. A couple of tests could never fail because they were
overriding the failure return code.

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tests: fix unit tests to run with a dynamic log directory

Ref: #10818

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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curl_get_line: allow last line without newline char

improve backwards compatibility

Test 3200 verifies

Closes #9973