avutil: move av_get_time_base_q() after include rational.h

Fix compilation
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavutil/avutil.h

@@ -239,11 +239,6 @@ enum AVMediaType {
 
 #define AV_TIME_BASE_Q          (AVRational){1, AV_TIME_BASE}
 
-/**
- * Return the fractional representation of the internal time base.
- */
-AVRational av_get_time_base_q(void);
-
 /**
  * @}
  * @}
@@ -282,6 +277,11 @@ char av_get_picture_type_char(enum AVPictureType pict_type);
 #include "version.h"
 #include "macros.h"
 
+/**
+ * Return the fractional representation of the internal time base.
+ */
+AVRational av_get_time_base_q(void);
+
 /**
  * @}
  * @}