udp: remove resource.h inclusion, it breaks mingw compilation.

The header seems unneeded, if its needed we will put it back with appropriate #if
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/udp.c

@@ -36,7 +36,6 @@
 #include "os_support.h"
 #include "url.h"
 #include <pthread.h>
-#include <sys/resource.h>
 #include <sys/time.h>
 
 #ifndef IPV6_ADD_MEMBERSHIP