Rename mp4 to mpeg4
Hide internal symbols in shared library
Simplify handle creation
Make handle table thread-safe
Clean up ve.c
Make VE memory allocation thread-safe
Make VE thread-safe
Fix mpeg1&2 quantization matrix

Vdpau provides the quantisation matrix converted to raster order,
but the video engine wants original order, so undo it.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Makefile