T10547: Make helpers in LIBEXEC testable, make LIBEXEC runtime settable

[Stefan Brüns]

bruns created this task.

TASK DESCRIPTION
  While pathes to executables (PATH) and plugins (QT_PLUGIN_PATHS) can be adjusted, LIBEXEC is hardcoded, see e.g.:
  
  https://community.kde.org/Frameworks/Porting_Notes/KStandardDirs
  
  > KStandardDirs::findExe (and the use of the "exe" resource) can be ported to QStandardPaths::findExecutable, except when the executable comes from libexec, in which case the path should just be hardcoded using CMAKE_INSTALL_PREFIX "/" LIBEXEC_INSTALL_DIR.
  
  This makes it impossible to test any private helpers without installing them. Worse, this may give false positives are hide errors when running tests from inside the build directory.

TASK DETAIL
  https://phabricator.kde.org/T10547

To: bruns
Cc: #frameworks, bruns
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