mss: Listen on all port for incoming SRT stream

This allow the source to be on separate computer.

src/main.c

@@ -6,7 +6,7 @@
 #define GST_USE_UNSTABLE_API
 #include <gst/webrtc/rtcsessiondescription.h>
 
-#define DEFAULT_SRT_URI "srt://127.0.0.1:7001"
+#define DEFAULT_SRT_URI "srt://:7001"
 #define DEFAULT_RIST_ADDRESSES "127.0.0.1:5004"
 
 static gchar *srt_uri = NULL;