playsink: Use correct property enum value for video-filter property installation
audiodecoder: should post DECODE errors and not ENCODE

Fix error code for audio decoder
appsink: Fix gst_app_sink_pull() docs to transfer full for the return value

Also we get a GstSample, not a GstBuffer here.
rtspconnection: call watch notify before freeing any watch resources

This gives control to the notify function allowing it to finish other
watch related functionality.

https://bugzilla.gnome.org/show_bug.cgi?id=737752
tests: dist header file needed for ABI checks on powerpc32

Fixes 'make check' on debian powerpc32 buildbot:
libs/libsabi.c:95:26: fatal error: struct_ppc32.h: No such file or directory
Update .po files
Release 1.4.4