Phonon/Releases/Core/4.7.2

URL	http://download.kde.org/stable/phonon/4.7.2/phonon-4.7.2.tar.xz.mirrorlist
SHA256	819e9734d20e254b4599d8ab45f15a68d95444c4e2088c7eb5769b58976a11be

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.