* modules/codec/spudec/spudec.c, modules/codec/spudec/text.c: fixed the
   race condition between spudec and vout. This patch may not be all that
   nice because it does a lot of vlc_object_find() but it is the only
   solution I've been able to come-up with.
   Oh and I didn't fix the memory leak caused by the font when using text
   subtitles. If the vout changes while the spudec is running then we don't
   unload this font.