Build FFmpeg #150

Job	Run time
Pre Checks	1s
Build base image	1m 30s
Build target base image (win64)	1m 36s
Build target base image (win32)	31s
Build target-variant image (win64, gpl)	3m 54s
Build target-variant image (win64, gpl 7.0)	3m 14s
Build target-variant image (win32, gpl)	3m 27s
Build target-variant image (win32, gpl 7.0)	3m 24s
Build ffmpeg (win64, gpl)	10m 2s
Build ffmpeg (win64, gpl 7.0)	9m 18s
Build ffmpeg (win32, gpl)	8m 45s
Build ffmpeg (win32, gpl 7.0)	8m 37s
Publish release	1m 53s
	56m 12s

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