audio: re-enable bits that depend on pbutils, disabled b/c of circular dependency
Submitted by Marvin Schmidt
Trying to build current 0.11 branch (811a8961 playsink: fix ts_offset refcounting) fails with the following error:
In file included from ../../../gst-libs/gst/audio/audio.h:27:0,
../../../gst-libs/gst/audio/multichannel.h:21:39: fatal error: gst/audio/audio-enumtypes.h: No such file or directory
make: *** [libgstpbutils_0.11_la-descriptions.lo] Error 1
audio-enumtypes.h wasn't yet created at that point, because the audio library is build after pbutils as it links against it
pbutils depends on the audio and hence creating a circular dependency between the two.