Add missing includes in bfin and sh4 files

Originally committed as revision 22342 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/sh4/dsputil_sh4.h

@@ -19,6 +19,9 @@
 #ifndef AVCODEC_SH4_DSPUTIL_SH4_H
 #define AVCODEC_SH4_DSPUTIL_SH4_H
 
+#include "libavcodec/avcodec.h"
+#include "libavcodec/dsputil.h"
+
 void idct_sh4(DCTELEM *block);
 void dsputil_init_align(DSPContext* c, AVCodecContext *avctx);