build: update mxf muxer dependencies

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/Makefile

@@ -631,7 +631,7 @@ OBJS-$(CONFIG_MOV_DEMUXER)             += mpeg4audio.o mpegaudiodata.o ac3tab.o
 OBJS-$(CONFIG_MOV_MUXER)               += mpeg4audio.o mpegaudiodata.o
 OBJS-$(CONFIG_MPEGTS_MUXER)            += mpeg4audio.o
 OBJS-$(CONFIG_MPEGTS_DEMUXER)          += mpeg4audio.o mpegaudiodata.o
-OBJS-$(CONFIG_MXF_MUXER)               += timecode.o
+OBJS-$(CONFIG_MXF_MUXER)               += timecode.o dnxhddata.o
 OBJS-$(CONFIG_NUT_MUXER)               += mpegaudiodata.o
 OBJS-$(CONFIG_OGG_DEMUXER)             += xiph.o flac.o flacdata.o     \
                                           mpeg12data.o vorbis_parser.o \