eval: include our headers after system headers

Originally committed as revision 19612 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/eval.c

@@ -28,14 +28,14 @@
  * see http://joe.hotchkiss.com/programming/eval/eval.html
  */
 
-#include "avcodec.h"
-#include "eval.h"
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
 
+#include "avcodec.h"
+#include "eval.h"
+
 #ifndef NAN
   #define NAN 0.0/0.0
 #endif