Add workaround from QTBUG-129651 for iOS FFMPEG linking #5435

Job	Run time
Build vars & Github release (if required)	19s
Build for Linux .deb armhf (artifacts)	3m 33s
Build for MacOS Legacy (artifacts+CodeQL)	12m 37s
Build for Windows JACK (artifact)	8m 3s
Build for Android .apk (artifact+codeQL)	32m 23s
Build for Windows (artifact+codeQL)	21m 23s
Build for iOS (artifacts)	3m 10s
Build for Linux .deb amd64 (artifacts+codeQL)	7m 27s
Build for MacOS (artifacts)	6m 1s
Build for Linux .deb arm64 (artifacts)	2m 41s
Create files for .deb repository (if requested)	-1s
	1h 37m 36s

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