[gnutls-devel] GnuTLS | Fix compiler warnings (!2124)

[(Deprecated) Read-only notification of GnuTLS library development activities]

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2124

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

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

* eagain-cli: suppress -Wunused-but-set-variable warning

* build: suppress -Wdiscarded-qualifiers warnings

The string search functions, such as strstr, etc., now checks the
return type matches the first argument.

* cert: suppress -Wunused-but-set-parameter warning

This makes get_issuers validate the input data size to properly "use"
the argument.

* supported_groups: suppress -Wreturn-type warnings

For historical reasons, an entity (GNUTLS_CLIENT or GNUTLS_SERVER) is
defined as part of gnutls_init_flags_t enum which has more members and
prevents using a switch to cover all branches.

## 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)

## 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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