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

[Hannah von Reth]

vonreth created this revision.
Herald added projects: Frameworks, Build System.
Herald added subscribers: kde-buildsystem, kde-frameworks-devel.
vonreth requested review of this revision.

REVISION SUMMARY
  Raise C from C89 ti C90 as C89 is not supported by the CMAKE flag
  
  https://cmake.org/cmake/help/v3.16/prop_tgt/C_STANDARD.html#prop_tgt:C_STANDARD

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  cmake_c_standard

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

AFFECTED FILES
  kde-modules/KDECompilerSettings.cmake

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