[gnutls-devel] GnuTLS | handshake: only shuffle extensions in the first Client Hello (!1930)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1930

Project:Branches: dueno/gnutls:wip/dueno/no-shuffle-extensions to gnutls/gnutls:master
Author:   Daiki Ueno




<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

* handshake: only shuffle extensions in the first Client Hello

RFC 8446 section 4.1.2 states that the second Client Hello after HRR
should preserve the same content as the first Client Hello with
limited exceptions.  Since GnuTLS 3.8.5, however, the library started
shuffling the order of extensions for privacy reasons and that didn't
comply with the RFC, leading to a connectivity issue against the
server configuration with a stricter check on that.

Fixes: #1660 

## 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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