bug#27224: vlc: add support pour RTSP

[Clément Lassieur]

Hi,

Those four patches add support for RTSP to VLC.

livemedia-utils makes it possible to read this example stream:
rtsp://mpv.cdn3.bigCDN.com:554/bigCDN/_definst_/mp4:bigbuckbunnyiphone_400.mp4.

But for other streams, like those listed at
http://mafreebox.freebox.fr/freeboxtv/playlist.m3u, libdvbpsi is needed
as well.  (I'm afraid one probably needs to be in the Free (free.fr)
network to access the streams.)