D6772: Fix usage of query_qmake: differ between calls expecting qmake or not

[Friedrich W. H. Kossebau]

kossebau created this revision.
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REVISION SUMMARY
  when KDE_INSTALL_USE_QT_SYS_PATHS has been explicitely set,
  qmake can be considered a required dependency, otherwise the
  paths will not be known, which would be unexpected.
  Also does the code calling query_qmake, besides the one testing
  for the same install prefix, not handle the case of empty strings
  being returned and then results in bogus behaviour.
  
  Thus this patch makes code fail hard if query_qmake is expected
  to yield a result, but no qmake executable is found.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  handlenoqmakefound

REVISION DETAIL
  https://phabricator.kde.org/D6772

AFFECTED FILES
  kde-modules/KDEInstallDirs.cmake
  modules/ECMAddQch.cmake
  modules/ECMGeneratePriFile.cmake
  modules/ECMQueryQmake.cmake

To: kossebau, #frameworks, ltoscano, rdieter
Cc: #build_system
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