- Fix CMake 3 compatibility by synchronizing the FindQt4.cmake module from kdelibs git.
- Prevent possible internal infinite loop call chains when trying to handle backend construction in simulation mode (i.e. without actual backend being installed on the system).
- When not building with PHONON_INSTALL_QT_EXTENSIONS_INTO_SYSTEM_QT, make sure that the relative Qt paths are set according to whether the build is meant for Qt4 or 5. Previously this would always install to a path for qt5.
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