Patch by Glen Gray: RTSP keep alive fix. If the server doesn't handle RTCP-RR...

Patch by Glen Gray: RTSP keep alive fix. If the server doesn't handle RTCP-RR packets and requires specific GET_PARAMETER commands (such as Kasenna) then the session times out when vlc is paused because the current version only sends the info when Demux() is called. Demux() is only called when data is received. This patch fixes this issue with a boolean that is set during PAUSED state that allows the timer thread to send the GET_PARAMTER messages instead and thus keeping the RTSP session alive.

THANKS

@@ -85,6 +85,7 @@ Frank Chao <frank0624 at gmail.com> - Chinese Traditional translation
 Fumio Nakayama <endymion at ca2.so-net.ne.jp> - Japanese translation
 Georgi Chorbadzhiyski <gf at unixsol dot org> - HTTP access error handling fix
 Gisle Vanem <giva at bgnet dot no>  - gettieoffay under win32
+Glen Gray <slaine at slaine do rog> - RTSP keepalive
 Greg Farrell <greg at gregfarell dot org> - rc interface "enqueue" command
 Gregory Hazel <ghazel at gmail dot com> - wxWidgets fixes and improvements
 Goetz Waschk <waschk at informatik.uni-rostock dot de> - Mandrake packages