avcodec/vp9_raw_reorder_bsf: Remove unnecessary header

This bsf doesn't have any options, so including libavutil/opt.h is
unnecessary.
Reviewed-by: Peter Ross <pross@xvid.org>
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/vp9_raw_reorder_bsf.c

@@ -20,7 +20,6 @@
 #include "libavutil/intmath.h"
 #include "libavutil/log.h"
 #include "libavutil/mem.h"
-#include "libavutil/opt.h"
 
 #include "bsf.h"
 #include "get_bits.h"