Fix undefined preprocessor directives warnings during 'make checkheaders'.

Originally committed as revision 16747 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/network.h

@@ -21,6 +21,8 @@
 #ifndef AVFORMAT_NETWORK_H
 #define AVFORMAT_NETWORK_H
 
+#include "config.h"
+
 #if HAVE_WINSOCK2_H
 #include <winsock2.h>
 #include <ws2tcpip.h>

libavformat/os_support.h

@@ -27,6 +27,8 @@
  * miscellaneous OS support macros and functions.
  */
 
+#include "config.h"
+
 #ifdef __MINGW32__
 #  include <fcntl.h>
 #  define lseek(f,p,w) _lseeki64((f), (p), (w))