rename mxf.c to mxfdec.c

Originally committed as revision 14655 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -108,7 +108,7 @@ OBJS-$(CONFIG_MPJPEG_MUXER)              += mpjpeg.o
 OBJS-$(CONFIG_MSNWC_TCP_DEMUXER)         += msnwc_tcp.o
 OBJS-$(CONFIG_MTV_DEMUXER)               += mtv.o
 OBJS-$(CONFIG_MVI_DEMUXER)               += mvi.o
-OBJS-$(CONFIG_MXF_DEMUXER)               += mxf.o
+OBJS-$(CONFIG_MXF_DEMUXER)               += mxfdec.o
 OBJS-$(CONFIG_NSV_DEMUXER)               += nsvdec.o
 OBJS-$(CONFIG_NULL_MUXER)                += raw.o
 OBJS-$(CONFIG_NUT_DEMUXER)               += nutdec.o nut.o riff.o