for review: add mercury_opengl library

[David Glen JEFFERY]

> New File: extras/graphics/mercury_opengl/mercury_opengl.m
> ===================================================================
> %-----------------------------------------------------------------------------%
> % Copyright (C) 1997 The University of Melbourne.
> % This file may only be copied under the terms of the GNU Library General
> % Public License - see the file COPYING.LIB in the Mercury distribution.
> %-----------------------------------------------------------------------------%
> %-----------------------------------------------------------------------------%
> 
> % mercury_opengl -- a Mercury binding for OpenGL.
> 
> :- module mercury_opengl.
> 
> :- import_module mglu, mogl, mtogl.

You should probably have some kind of bugus declaration in here so that you
don't get a warning about having nothing exported. Eg.
	:- type dont_get_a_warning.
will do.

Hmmm... we really need some kind of package mechanism, don't we! :-)

(I haven't looked closely at the rest of the diff, so you might want to wait
for Tom's comments before committing).


love and cuddles,
dgj
-- 
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