po: set gettext domain in Makevars so we don't have to patch the generated Makefile.in.in

https://bugzilla.gnome.org/show_bug.cgi?id=705455
Automatic update of common submodule

From dbedaa0 to d48bed3
qtdemux: Fix calcuation of descriptor length

https://bugzilla.gnome.org/show_bug.cgi?id=720813
matroskamux: basic adpcm support

https://bugzilla.gnome.org/show_bug.cgi?id=664339
matroskademux: Check for the correct size of codec_data in the ACM case
matroskamux: Use correct codec id for ADPCM/DVI
vp9dec: Require vpx >= 1.3.0 for building vp9dec and vp9enc

Previous versions did not have a stable bitstream for VP9.

https://bugzilla.gnome.org/show_bug.cgi?id=720986
matroskamux: adpcm max block align is 8192
rndbuffersize: Proxy CAPS, ALLOCATION, SCHEDULING and srcpad events properly