to be able to compile without HAVE_AV_CONFIG_H

patch by Ronald S. Bultje: [rsbultje gmail com]
original thread: [FFmpeg-devel] ffmpeg.c/cmdutils.c compilation
date: 06/23/2007 03:15 AM

Originally committed as revision 9453 to svn://svn.ffmpeg.org/ffmpeg/trunk

cmdutils.c

@@ -19,6 +19,10 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
 #include "avformat.h"
 #include "cmdutils.h"
 #include "avstring.h"