tests: make git ignore new test binary
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
videoconvert: Fix I420 to BGRA fast-path alpha setting

This fast-path was adding 128 to every component including
alpha while it should only be done for all components except
alpha. This caused wrong alpha values to be generated.

Also remove the high-quality I420 to BGRA fast-path as it needs
the same fix, which causes an additional instruction, which causes
orc to emit more than 96 variables, which then just crashes.
This can only be fixed in orc by breaking ABI and allowing more
variables.
colorbalance: add missing annotation for list_channels()

https://bugzilla.gnome.org/show_bug.cgi?id=720999