D23930: Set XCB to required if building the X backend

[David Edmundson]

davidedmundson created this revision.
Herald added a project: Frameworks.
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davidedmundson requested review of this revision.

REVISION SUMMARY
  Otherwise builds could fail on missing dependencies at build time,
  rather than configure time.
  
  This was previously broken, but my extra dependency on XCB::Res made it
  noticable.

REPOSITORY
  R278 KWindowSystem

BRANCH
  master

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

AFFECTED FILES
  CMakeLists.txt

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