avutil/integer: Don't include common.h

Reviewed-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavutil/integer.c

@@ -25,9 +25,11 @@
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 
-#include "common.h"
+#include <string.h>
+
 #include "integer.h"
 #include "avassert.h"
+#include "intmath.h"
 
 static const AVInteger zero_i;