network: #include stdint.h in network.h

This header uses various types provided by stdint.h without
explicitly including it.
Signed-off-by: Mans Rullgard <mans@mansr.com>

libavformat/network.h

@@ -22,6 +22,7 @@
 #define AVFORMAT_NETWORK_H
 
 #include <errno.h>
+#include <stdint.h>
 
 #include "config.h"
 #include "libavutil/error.h"