rtspsrc: Proxy rtpjitterbuffer do-retransmission property

https://bugzilla.gnome.org/show_bug.cgi?id=722866
rtspsrc: add signal to notify of new manager

So that you can configure and connect to signals on the rtpbin.

See https://bugzilla.gnome.org/show_bug.cgi?id=722866
Revert "rtspsrc: Proxy rtpjitterbuffer do-retransmission property"

This reverts commit 9f7b1128b1f00a2b87a232ff890867549ab95ba5.

This should be handled automatically be rtspsrc if the AVPF profile
is used, and manual enabling of it can be done with the new-manager
signal.
v4l2: guard use of ENODATA with #ifdef

Not all systems with v4l have ENODATA defined, so check that we have it
before attempting to use it.

https://bugzilla.gnome.org/show_bug.cgi?id=722953
ac3parse: custom get_sink_caps handling for private stream caps

... now that those are transformed rather than parsed, some transforming
of caps is required as well to make auto-plugging succeed.
check: Use fakesink sync=True instead of an audio sink

Ensures the test can run on systems without alsa (or any audio output for
that matter), and will avoid people running build slaves wondering what
the hell was beeping during the night :)
wavparse: Ignore Broadcast Wave Format (BWF) tags when searching for 'fmt' chunk

https://bugzilla.gnome.org/show_bug.cgi?id=723125
Automatic update of common submodule

From d48bed3 to 1a07da9