Build FFmpeg #142

Job	Run time
Pre Checks	1s
Build base image	1m 23s
Build target base image (win64)	29s
Build target base image (win32)	1m 36s
Build target-variant image (win64, gpl)	3m 56s
Build target-variant image (win64, gpl 7.0)	3m 25s
Build target-variant image (win32, gpl)	7m 8s
Build target-variant image (win32, gpl 7.0)	11m 6s
Build ffmpeg (win64, gpl)	10m 20s
Build ffmpeg (win64, gpl 7.0)	10m 7s
Build ffmpeg (win32, gpl)	7m 44s
Build ffmpeg (win32, gpl 7.0)	7m 30s
Publish release	2m 2s
	1h 6m 47s

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