Skip tests/tls13/prf.c if visibility 'protected' doesn't work
Overriding gnutls_rnd() with visibility 'protected' doesn't always work. E.g. LDFLAGS="-Wl,-Bsymbolic-functions" seems to have priority on Debian derived systems.
Fixes #584
Checklist
- [*] Code modified for feature
- [*] Test suite updated with functionality tests
Reviewer's checklist:
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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
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This feature/change has adequate documentation added -
No obvious mistakes in the code
Edited by Nikos Mavrogiannopoulos