Build FFmpeg on pull request

Bump ffmpeg-source from `d5cc9d8` to `fa20f5c` #447

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Run time

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Job	Run time
build (win64)	1h 44m 3s
build (win32)	1h 25m 50s
archive (win64)	2m 7s
archive (win32)	1m 45s
release	16s
	3h 14m 1s