GnuTLS | Fix CRAU_MAYBE_UNUSED definition for old compilers (!2106)

Ryan Carsten Schmidt created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2106

Project:Branches: ryandesign/gnutls:patch-1 to gnutls/gnutls:master
Author:   Ryan Carsten Schmidt



* Fix CRAU_MAYBE_UNUSED definition for old compilers

Fix behavior change that caused build failure with clang versions older
than 17, introduced in f5666f8f1f653cfe2bef808a9c9b61534f279ed1.

Also ensure CRAU_MAYBE_UNUSED is always defined to something, for even
older compilers.

Fixes #1880

## Checklist
 * [ ] 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)

## 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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