Embed FFmpeg dylibs with qmake/pro

6.8.0 added a new cmake function - qt6_add_ios_ffmpeg_libraries - which sets several properties on the target application, resulting in FFmpeg dynamic libraries embedded (and signed) into the application bundle. qmake-based solutions do not have the functionality mentioned, so manual embedding and setting different flags is still required (if xcode project is generated by qmake), worse so, qt-creator does not have UI that allows to embed libraries - either qmake itself or some of its scripts must be updated to enable embedding FFmpeg (if possible).