[gnutls-devel] GnuTLS | tls1-prf: mark use of non-EMS PRF non-approved in FIPS (!1752)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1752

Project:Branches: dueno/gnutls:wip/dueno/ems-followup to gnutls/gnutls:master
Author:   Daiki Ueno




It turned out that enforcing EMS in TLS 1.2 causes interoperability
issues, even though it is required by FIPS 140-3.  Instead of
hard-blocking non-EMS KDF, this reports the usage of such KDF through
the service indicator, that is done by marking the use of non-EMS
label, i.e., "master secret", as non-approved.

## 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)
 * [ ] 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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