D8256: Add _XOPEN_SOURCE to C definitions

[David Faure]

dfaure added a comment.


  Indeed,
  
  22:23:51 In file included from /usr/include/sys/mount.h:36:
  22:23:51 /usr/include/sys/ucred.h:84:2: error: unknown type name 'u_int'; did you mean 'uint'?
  22:23:51         u_int   cr_version;             /* structure layout version */
  22:23:51         ^
  
  https://build.kde.org/view/Frameworks/job/Frameworks%20kcoreaddons%20kf5-qt5%20FreeBSDQt5.11/5/console
  
  I'll revert.

REPOSITORY
  R240 Extra CMake Modules

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

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