linux: add shared lib for sse4 operations

Conflicts:
	configure.in
vaapi: option to enable sw filters

Conflicts:
	xbmc/cores/dvdplayer/DVDCodecs/Video/VAAPI.cpp
	xbmc/cores/dvdplayer/DVDCodecs/Video/VAAPI.h
X11: check for user output on resize window
dvdplayer: flush ffmpeg after hw decoder returned an error
xbmc pr 3080
set preatpicture if pts is equal to last frame
Introduce SWCodec - these are codecs that don't have any GPU acceleration (yet) - add HVEC
vdpau: map/unmap surfaces on every cycle, requested by AMD
ActiveAE: add some debug logging
Change swfilter to be visible in Advanced setting level
vaapi: fix build
no hevc in ffmpeg 1.2