The dv1394 demuxer depends on dv.o.

This fixes the following option set:
  --disable-encoders --disable-decoders --disable-parsers --disable-bsfs
  --disable-muxers --disable-demuxers --disable-protocols
  --enable-demuxer=dv1394

Originally committed as revision 9645 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -40,7 +40,7 @@ OBJS-$(CONFIG_DSICIN_DEMUXER)            += dsicin.o
 OBJS-$(CONFIG_DTS_DEMUXER)               += raw.o
 OBJS-$(CONFIG_DV_DEMUXER)                += dv.o
 OBJS-$(CONFIG_DV_MUXER)                  += dvenc.o
-OBJS-$(CONFIG_DV1394_DEMUXER)            += dv1394.o
+OBJS-$(CONFIG_DV1394_DEMUXER)            += dv1394.o dv.o
 OBJS-$(CONFIG_DXA_DEMUXER)               += dxa.o
 OBJS-$(CONFIG_EA_DEMUXER)                += electronicarts.o
 OBJS-$(CONFIG_FFM_DEMUXER)               += ffm.o