dv1394 depends on dv_demuxer, fixes linking with demuxers disabled.

patch by Aurel

Originally committed as revision 11258 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -800,7 +800,7 @@ audio_beos_muxer_deps="audio_beos"
 audio_beos_muxer_extralibs="-lmedia -lbe"
 avisynth_demuxer_deps="avisynth"
 bktr_demuxer_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
-dv1394_demuxer_deps="dv1394"
+dv1394_demuxer_deps="dv1394 dv_demuxer"
 libdc1394_demuxer_deps="libdc1394"
 libnut_demuxer_deps="libnut"
 libnut_muxer_deps="libnut"