libspeexdec: include system headers before local headers

libavcodec/libspeexdec.c

@@ -18,11 +18,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "avcodec.h"
 #include <speex/speex.h>
 #include <speex/speex_header.h>
 #include <speex/speex_stereo.h>
 #include <speex/speex_callbacks.h>
+#include "avcodec.h"
 
 typedef struct {
     SpeexBits bits;