[gnutls-devel] GnuTLS | Fix warn_unused_result for clang < 4 (!1016)

[Development of GNU's TLS library]

New Merge Request !1016

https://gitlab.com/gnutls/gnutls/merge_requests/1016

Branches: tmp-fix-travis to master
Author:    Tim Rühsen
Assignees: 


Fix OSX Travis CI runner. Clang < 4 does not implement warn_unused_result though the advertised gcc version implies it.

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