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Signed-off-by: Aaron Plattner <aplattner@nvidia.com>

* Add a --with-module-dir configure parameter.

* Pass the moduledir into the wrapper.  Use it to construct the path to search
  for drivers.  Require drivers to end in a ".1" version, in case we ever want
  to rev. the interface between the wrapper and the drivers.

* If no driver is found in the new module dir, look for one in the default
  search paths.  This is intended to find libvdpau_nvidia.so for drivers that
  predate the change to move it, and can be removed in the future.

* Stash the moduledir into vdpau.pc.  Drivers can find this with
  `pkg-config --variable=moduledir vdpau`.

* Add a version to libvdpau_trace.so in case the interface between it and
  libvdpau.so ever changes.

* Install libvdpau_trace.so.1 to moduledir instead of libdir.
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Aaron Plattner <aplattner@nvidia.com>

* Uninstall the docs if they were installed.
* Remember to distribute Doxyfile and vdpau_data_flow.png in the
  tarball.
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Stephen Warren <swarren@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.

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.