D24841: Use modern way to set the C/CXX standad

[Hannah von Reth]

vonreth added reviewers: dfaure, cullmann.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D24841

To: vonreth, dfaure, cullmann
Cc: kde-frameworks-devel, kde-buildsystem, LeGast00n, GB_2, bencreasy, michaelh, ngraham, bruns
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