avdevice/vfwcap: put the headers back in the order in which they need to be

This avoids build failures
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavdevice/vfwcap.c

@@ -19,8 +19,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include <vfw.h>
 #include <windows.h>
+#include <vfw.h>
 
 #include "libavutil/internal.h"
 #include "libavutil/log.h"