build: tidy up deprecation suppression, enable warnings for clang

Suppress deprecation warnings the closest to the deprecated code, using
`CURL_IGNORE_DEPRECATION()`. Then drop build-spe

build: tidy up deprecation suppression, enable warnings for clang

Suppress deprecation warnings the closest to the deprecated code, using
`CURL_IGNORE_DEPRECATION()`. Then drop build-specific suppressions, and
file-wide ones. The latter is not compatible with Unity mode. Also
replace manual suppressions with a macro to apply to all compilers with
deprecation warning support. Also enable deprecation warnings for clang.

- curl/curl.h: enable deprecation warnings for clang.

- docs/examples: stop setting `CURL_DISABLE_DEPRECATION` with autotools.
Suppression moved to C-level earlier. Syncs with cmake.
Follow-up to 5fc61a37c1b177cefbc11dc9f5eef7b2a14538da #14123

- tests/http/clients: stop setting `CURL_DISABLE_DEPRECATION` in
autotools. If it becomes necessary in the future, it can be done in
C via the macro. Syncs with cmake.

- lib1545: stop setting `CURL_DISABLE_DEPRECATION` in autotools.
Drop guard from test source.
Follow-up to 0f103600731f7e08637017ef4df67a194e0d6711 #12444

- libtest, unit: replace `CURL_DISABLE_DEPRECATION` with
`CURL_IGNORE_DEPRECATION()`.

- docs/examples: replace pragmas with `CURL_IGNORE_DEPRECATION()`.

Closes #14789

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examples: suppress deprecation warnings locally

Simplify making clean builds by silencing deprecation warnings inside
the example code where these may occur.

Drop related build

examples: suppress deprecation warnings locally

Simplify making clean builds by silencing deprecation warnings inside
the example code where these may occur.

Drop related build tweaks/comments from GHA jobs.

Example warning:
```
curl/docs/examples/postit2-formadd.c:65:16: error: 'CURLFORM_COPYNAME' is deprecated: since 7.56.0. Use curl_mime_name() [-Werror=deprecated-declarations]
65 | CURLFORM_COPYNAME, "sendfile",
| ^~~~~~~~~~~~~~~~~
```
Ref: https://github.com/curl/curl/actions/runs/9841099503/job/27166970904#step:10:829

Closes #14123

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examples: delete unused includes

Delete a bunch of unnecessary-looking headers from some examples. This
is known to be tricky on AIX (perhaps also in other less-tested envs).

Le

examples: delete unused includes

Delete a bunch of unnecessary-looking headers from some examples. This
is known to be tricky on AIX (perhaps also in other less-tested envs).

Let me know if any of this looks incorrect or outright fails on some
systems.

Follow-up to d4b85890555388bec212b75f47a5c1a48705b156 #13771
Closes #13785

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examples: fix compiling with MSVC

- `websocket.c`: use `Sleep()` on Windows.
`sleep()` and `unistd.h` are not available in MSVC.

- `http2-upload.c`: use local `gettimeofday()`

examples: fix compiling with MSVC

- `websocket.c`: use `Sleep()` on Windows.
`sleep()` and `unistd.h` are not available in MSVC.

- `http2-upload.c`: use local `gettimeofday()` implementation when
compiled with MSVC.
(Alternate solution is to disable the trace function for MSVC.)
Public domain code copied and adapted from libssh2:
https://github.com/libssh2/libssh2/blob/e973493f992313b3be73f51d3f7ca6d52e288558/src/misc.c#L719-L743

- silence compiler warning for deprecated `inet_addr()`.
Also drop duplicate winsock2 include.
```
curl\docs\examples\externalsocket.c(125,32): error C2220: the following warning is treated as an error [curl\bld\docs\examples\curl-example-externalsocket.vcxproj]
curl\docs\examples\externalsocket.c(125,32): warning C4996: 'inet_addr': Use inet_pton() or InetPton() instead or define _WINSOCK_DEPRECATED_NO_WARNINGS to disable deprecated API warnings [curl\bld\docs\examples\curl-example-e
```
Ref: https://github.com/curl/curl/actions/runs/9227337318/job/25389073450#step:4:95

- silence an MSVC compiler warning. This is in conflict with `checksrc`
rules, so silence the rule in favour of the warning-free C syntax.
```
curl\docs\examples\multi-legacy.c(152,1): error C2220: the following warning is treated as an error [curl\bld\docs\examples\curl-example-multi-legacy.vcxproj]
curl\docs\examples\multi-legacy.c(152,1): warning C4706: assignment within conditional expression [curl\bld\docs\examples\curl-example-multi-legacy.vcxproj]
```
Ref: https://github.com/curl/curl/actions/runs/9227337318/job/25389073450#step:4:226

- do not use `sys/time.h` and `unistd.h` in Windows builds.
Some of these includes look unnecessary. Subject to another PR.

Cherry-picked from #13766
Closes #13771

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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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docs/examples: avoid deprecated options in examples where possible

Example programs targeting a deprecated feature/option are commented with
a warning about it.
Other examples are ad

docs/examples: avoid deprecated options in examples where possible

Example programs targeting a deprecated feature/option are commented with
a warning about it.
Other examples are adapted to not use deprecated options.

Closes #9661

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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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docs/examples: use curl_multi_poll() in multi examples

The API is soon two years old and deserves being shown as the primary
way to drive multi code as it makes it much easier to write c

docs/examples: use curl_multi_poll() in multi examples

The API is soon two years old and deserves being shown as the primary
way to drive multi code as it makes it much easier to write code.

multi-poll: removed

multi-legacy: add to show how we did multi API use before
curl_multi_wait/poll.

Closes #7352

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copyright: fix year ranges

Follow-up from 4d2f8006777

curl.se: new home

Closes #6172

docs/examples: URL updates

- also update two URLs outside of docs/examples
- fix spelling of filename persistant.c
- fix three long lines that started failing checksrc.pl

Cl

docs/examples: URL updates

- also update two URLs outside of docs/examples
- fix spelling of filename persistant.c
- fix three long lines that started failing checksrc.pl

Closes https://github.com/curl/curl/pull/3036

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docs/examples: do not wait when no transfers are running

Closes #2948

examples: bring back curl_formadd-using examples

... now with a -formadd suffix. While the new mime API is introduced in
7.56.0 we must acknowledge that lots of users can't upgrade their

examples: bring back curl_formadd-using examples

... now with a -formadd suffix. While the new mime API is introduced in
7.56.0 we must acknowledge that lots of users can't upgrade their curl
versions immediately.

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