qsv-3.4.1.0

Provide many intel-qsv enhancements based on official ffmpeg-3.4.1:

• Add MJPEG decoding support
• Add MJPEG encoding support
• Add single/multiple input(s) overlay filter
• Enable hevc encoding on Linux
• HEVC/VP8/VC1/MPEG2 decoding conformance improvement
• Add deinterlace modes setting
• Add more h264/hevc encoding options
• Add FATE for H264 and HEVC decoders
• Fix vp8 decoding memory leak issue
• Fix hwupload failure issues
• Add RGB32 format support
• Improve performance for vpp bypass case
• Disable AVBR since it is not supported on Linux
• Load HEVC decoding/encoding hw plugins by default on Linux