Fix 'make checkheaders' on AltiVec-enabled systems.

git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@25316 b3059339-0415-0410-9bf9-f77b7e298cf2

swscale_internal.h

@@ -21,6 +21,8 @@
 #ifndef FFMPEG_SWSCALE_INTERNAL_H
 #define FFMPEG_SWSCALE_INTERNAL_H
 
+#include "config.h"
+
 #ifdef HAVE_ALTIVEC_H
 #include <altivec.h>
 #endif