D8256: Add _XOPEN_SOURCE to C definitions

[David Faure]

dfaure added a comment.


  Ah, found it in bugzilla :-)

REPOSITORY
  R240 Extra CMake Modules

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

To: awilcox, alexmerry, dfaure
Cc: kde-frameworks-devel, kde-buildsystem, mpyne, dfaure, michaelh, ngraham, bruns
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