phonon4qt5-backend-gstreamer from home:frispete:PyQt5 project

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For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:frispete:PyQt5/openSUSE_Leap_15.2/home:frispete:PyQt5.repo
zypper refresh
zypper install phonon4qt5-backend-gstreamer