[gnutls-devel] GnuTLS | accelerated: clear AVX bit if it cannot be queried through XSAVE (!1631)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1631

Project:Branches: dueno/gnutls:wip/dueno/cpuid-fixes to gnutls/gnutls:master
Author:   Daiki Ueno




The algorithm to detect AVX is described in 14.3 of "Intel® 64 and IA-32
Architectures Software Developer’s Manual".

GnuTLS previously only followed that algorithm when registering the
crypto backend, while the CRYPTOGAMS derived SHA code assembly expects
that the extension bits are propagated to _gnutls_x86_cpuid_s.

Fixes: #1282

## 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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