avcodec/mips/constants: Include intfloat.h in constants.h

Don't rely on the user including it (mostly indirectly).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/mips/constants.h

@@ -22,6 +22,8 @@
 #ifndef AVCODEC_MIPS_CONSTANTS_H
 #define AVCODEC_MIPS_CONSTANTS_H
 
+#include "libavutil/intfloat.h"
+
 extern const union av_intfloat64 ff_pw_1;
 extern const union av_intfloat64 ff_pw_2;
 extern const union av_intfloat64 ff_pw_3;