D8256: Add _XOPEN_SOURCE to C definitions

[David Faure]

dfaure accepted this revision.
dfaure added a comment.
This revision is now accepted and ready to land.


  I did a test compile with this locally and it seems fine indeed.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D8256

To: awilcox, alexmerry, dfaure
Cc: dfaure, #frameworks, #build_system
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