[gnutls-devel] GnuTLS | includes: define cleanup functions for the use with __attribute__((cleanup)) (!1662)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1662

Project:Branches: dueno/gnutls:wip/dueno/pointer-cleanup to gnutls/gnutls:master
Author:   Daiki Ueno




This introduces `GNUTLS_DEFINE_POINTER_CLEANUP_FUNC` macro and definine
wrapper functions around `gnutls_*_deinit`, to be used with the cleanup
attribute supported by modern C compilers.

That enables automatic cleanup of resources inside a function;
applications could initialize pointers like the following:

```c
  __attribute__((cleanup(gnutls_deinitp)))
    gnutls_session_t session = NULL;

  if (err)
    return err;
```

Then `gnutls_deinit` is automatically called on session when the
function returns error.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] 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)
 * [ ] 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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