Fix the compilation of some libavcodec/lib* files which were not

including libavcore/imgutils.h, which was required since the recent
avcodec_check_dimensions() -> av_check_image_size() transition.

Originally committed as revision 24734 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/libdiracdec.c

@@ -28,6 +28,7 @@
 * (http://dirac.sourceforge.net/specification.html).
 */
 
+#include "libavcore/imgutils.h"
 #include "libdirac.h"
 
 #undef NDEBUG

libavcodec/libopenjpeg.c

@@ -24,6 +24,7 @@
 * JPEG 2000 decoder using libopenjpeg
 */
 
+#include "libavcore/imgutils.h"
 #include "avcodec.h"
 #include "libavutil/intreadwrite.h"
 #define  OPJ_STATIC

libavcodec/libschroedingerdec.c

@@ -27,6 +27,7 @@
 * (http://dirac.sourceforge.net/specification.html).
 */
 
+#include "libavcore/imgutils.h"
 #include "avcodec.h"
 #include "libdirac_libschro.h"
 #include "libschroedinger.h"