[MPlayer-dev-eng] [PATCH] fix dvd miscompilation

[Nico Sabbi]

Hi,
this patch fixes compilation when you specify --disable-mpdvdkit 
--disable-dvdread.

I added to configure two variables to export  to config.mak and config.h:
DVDREAD (currently unused, but may be necessary later)
and HAVE_DVD ("yes" if any of mkdvdkit1/2 or dvdread is "yes").

I had to #ifdef HAVE_DVD almost all the code in stream_dvd.c (a 
technique that I
abhor) , because there are some global variables in the file that are 
used by demux_mkv.
When Moritz fixes that bad behavior we can conditionally compile 
stream_dvd.c
(adding in Makefile an ifeq($(HAVE_DVD),yes).

If no one object I will commit this patch tomorrow.

    Nico
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