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Closing an X display that had a VDPAU device created on it causes a crash.

Work around an identical libXext dlclose bug with the "Generic Event Extension"
by dlopening libXext.so.6 and leaving it open.

Original bug discovered and fixed by Robert Morell <rmorell@nvidia.com> in
commit 3b43955c

.

v2: Don't SKIP if creating the device fails.  Just attempting to create the
device installs the DRI2 extension that causes the problem.
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Robert Morell <rmorell@nvidia.com>

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.