[gnutls-devel] GnuTLS | Sockets: implement sendmsg()-like function on Win32 (!1377)

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Evgeny Grin created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1377

Project:Branches: karlson2k/gnutls:w32_sendmsg to gnutls/gnutls:master
Author:    Evgeny Grin



Finally unify sending on POSIX and Win32.
Used WSASend() to send multiple buffers on W32, like it done on POSIX with sendmsg()/writev().
Some logic was added to prevent overflows of parameters/return value (mostly hypothetical as all TLS packets must fit, but it's better to implement it now so code is future-proof).
Made some testing on W32 x64, walked code with debugger. Looks fine.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [x] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [x] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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