Remove a now unused field

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11014 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/udp.c

@@ -34,7 +34,6 @@ typedef struct {
     int local_port;
     int reuse_socket;
 #ifndef CONFIG_IPV6
-    struct ip_mreq mreq;
     struct sockaddr_in dest_addr;
 #else
     struct sockaddr_storage dest_addr;