D23815: [KConfig] port away from deprecated methods in Qt 5.14

[Pino Toscano]

pino added a comment.


  In D23815#528543 <https://phabricator.kde.org/D23815#528543>, @dfaure wrote:
  
  > If we want to enable this flag (to "punish" the first KDE developer who upgrades Qt, like me currently), then at least we should only do so in git checkouts, not in release tarballs.
  >  This is easy to do: `if (EXISTS "${CMAKE_SOURCE_DIR}/.git")`.
  
  
  Note that "being in git" does not imply "this is the development repository": there are distributions that maintain the sources expanded in git repositories [1], so the check would be mistakenly triggered in those cases.
  
  [1] https://wiki.debian.org/PackagingWithGit

REPOSITORY
  R237 KConfig

REVISION DETAIL
  https://phabricator.kde.org/D23815

To: dfaure, mdawson, arichardson, vkrause
Cc: pino, arojas, mlaurent, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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