D24052: Make cmake require both opengl and qtopengl before building gl support

[Jonathan Riddell]

jriddell added reviewers: whiting, mlaurent, yurchor.

REPOSITORY
  R417 KSudoku

REVISION DETAIL
  https://phabricator.kde.org/D24052

To: jriddell, #kde_games, whiting, mlaurent, yurchor
Cc: kde-games-devel
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