GnuTLS | accelerated: accept NULL as digest argument for gnutls_hash_output (!2048)

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2048

Project:Branches: dueno/gnutls:wip/dueno/hash-output to gnutls/gnutls:master
Author:   Daiki Ueno



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

* tests/slow: set TEST_EXTENSIONS for wrappers

* crypto-selftests: exercise gnutls_hash_output(..., NULL)

This moves the test introduced in commit
7a7d3e44c0f769eb7bae6c6ee21a0a8a3f9e5144, from tests/slow/hash-large.c
to the library selftests, because the former is tailored for
excessively large input, ignoring SIGSEGV.

* accelerated: accept NULL as digest argument for gnutls_hash_output

As a follow-up of commit eced4c0c2b3d3ee6a35dab99616a25910b623f79 this
also extends the accelerated version of gnutls_hash_output to be able
to reset the context by passing NULL as the digest argument.

Fixes: #1769

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [x] Test suite updated with functionality tests
 * [x] 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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