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Detect when doxygen, dot, and pdflatex are installed.  When they are, enable
documentation.  Add --enable-documentation and --disable-documentation to
override the autodetection.  Install the docs to the configured docdir (usually
$prefix/share/doc/libvdpau).

Steal the XORG_CHANGELOG macro from X.Org and stash it in acinclude.m4.

Add profiles for MPEG-4 part 2, DivX 4, and DivX 5.  Also add new high quality
scaling options.

Signed-off-by: Nicolas Chauvet <kwizart@gmail.com>

I forgot to include this change in commit
1290f7c1.

Without printouts, it's impossible to tell why VDPAU initialization fails when
it can't open the backend or trace libraries or can't find various symbols.