include all prerequisites in header files

Originally committed as revision 9344 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/qdm2data.h b/libavcodec/qdm2data.h
index 6d7d074..410ec46 100644
--- a/libavcodec/qdm2data.h
+++ b/libavcodec/qdm2data.h
@@ -31,6 +31,8 @@
 #ifndef QDM2DATA_H
 #define QDM2DATA_H
 
+#include <stdint.h>
+
 /** VLC TABLES **/
 
 /* values in this table range from -1..23; adjust retrieved value by -1 */