avutil/file: Don't include avutil.h

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

libavutil/file.h

@@ -19,9 +19,10 @@
 #ifndef AVUTIL_FILE_H
 #define AVUTIL_FILE_H
 
+#include <stddef.h>
 #include <stdint.h>
 
-#include "avutil.h"
+#include "attributes.h"
 
 /**
  * @file