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Re-add MesaLib files

Import MesaLib-7.7 as wip/MesaLib.

It s just a "meta-buildlink", to use
include "../../graphics/MesaLib/buildlink3.mk" without too much pain.

MesaLib is a 3-D graphics library with an API which is very similar to
that of OpenGL*.  To the extent that Mesa utilizes the OpenGL command syntax
or state machine, it is being used with authorization from Silicon Graphics,
Inc.  However, the author makes no claim that Mesa is in any way a
compatible replacement for OpenGL or associated with Silicon Graphics, Inc.

g/c some packages that made it into pkgsrc

Whitespace police and minor cosmetic surgery.

Add Mesa-7.0.3rc2, which is nearly done -- it just needs to be tested on
a lot of platforms.  MesaLib with dri builds for me fine on
NetBSD current, and so does glu--glut there is a tiny problem
that I'm too tired to find now.

The *entire* build is libtoolized (even some parts that we don't touch
yet).  One interesting result of this is that libtool's locking seems
to make it MAKE_JOBS_SAFE once again (requires gmake now, that's another
reason).  I took pains to ensure that
everything builds correctly (cross-compiling needs to be verified
and quite possibly fixed, though).  Please let me know if you
find a problem.

TODO: fix various issues (obviously), mostly correctness, consistency
and such (save for glut).
-- MesaDemos (no way I am touching that right now!).  I do not think
that this should be required for an import, personally.
-- Bundle required headers from each package and create another one
exclusively for them.  This will allow patching/updating headers
without having to rebuild binaries if we do not need to, and I
think it's cleaner than what we do now.
-- Split glw into another package?  Maybe.
-- builtin.mk stuff for dri ?
-- We also should discuss switching to freeglut by default.  Yeah,
   there aren't too many commits to it these days.  However, this is
   way better than glut, which has been effectively dead for years.

Prepare for import of shiny new Mesa-7.0.3-rc2 packages.  Almost ready
for pkgsrc ...

- Centralize haeder installation (similar to library installation).
- Make building of DRI support optional, based on the glx option.
  (same name as for x11/modular-xorg-server).
- Fix pkglint warnings.
- Don't rm part of the source tree, pass in the correct SRC_DIR setting.

The packages should work now, only thread library cleanup left to do.

Checkpoint commit of adding DRI option to MesaLib.
Currently unconditionally builds DRI support.

This is Mesa 6.5.2, primarily for recent modular X.org servers.

This package is from complete or polished and were unabashedly haphazardly put
together.  You have been warned, and please let me know about any problems,
etc.  Many thanks to Jeremy Reed for doing the bulk of the work (patches).