Build FFmpeg #138

Job	Run time
Pre Checks	1s
Build base image	2m 29s
Build target base image (win64)	1m 58s
Build target base image (win32)	42s
Build target-variant image (win64, gpl)	3m 31s
Build target-variant image (win64, gpl 7.0)	2m 48s
Build target-variant image (win32, gpl)	3m 50s
Build target-variant image (win32, gpl 7.0)	3m 54s
Build ffmpeg (win64, gpl)	9m 33s
Build ffmpeg (win64, gpl 7.0)	8m 58s
Build ffmpeg (win32, gpl)	4m 11s
Build ffmpeg (win32, gpl 7.0)	8m 44s
Publish release	0s
	50m 39s

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