Add missing header includes to fix 'make checkheaders'.

Originally committed as revision 14817 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/lpc.h

@@ -22,7 +22,8 @@
 #ifndef FFMPEG_LPC_H
 #define FFMPEG_LPC_H
 
-#include <inttypes.h>
+#include <stdint.h>
+#include "dsputil.h"
 
 #define ORDER_METHOD_EST     0
 #define ORDER_METHOD_2LEVEL  1