A commit on behalf of John (in turn, and in part, also on behalf of

A commit on behalf of John (in turn, and in part, also on behalf of
Thierry).

 * Renamed some of the old PLIB functions to have glut* prefixes.
   (I guess that there is some thought about exporting them to the
    API.)

 * Changes from Thierry for FreeBSD support, and/or results of testing?

 * I re-merged an XXX comment re. NetBSD/amd64 and propogated a
   comment on a duplicated #define for FreeBSD.  We need the GNU
   autoconfig stuff to be updated by someone who groks it, now.

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@460 7f0cb862-5218-0410-a997-914c9d46530a