D8256: Add _XOPEN_SOURCE to C definitions

[A. Wilcox]

awilcox added a comment.


  Please do note that `_XOPEN_SOURCE` must be `600` and not `700` because some components of KDE still use `rindex` which is no longer supported in X/Open 7 <http://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xsh_chap03.html>.

REPOSITORY
  R240 Extra CMake Modules

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

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