D23930: Set XCB to required if building the X backend

[Allen Winter]

winterz added a comment.


  +1
  will fix the problem I reported.

REPOSITORY
  R278 KWindowSystem

REVISION DETAIL
  https://phabricator.kde.org/D23930

To: davidedmundson, zzag
Cc: winterz, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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