Previous changes were made without the freeglut major mode in EMACS.

Previous changes were made without the freeglut major mode in EMACS.
Re-tweaked some lines (mostly got rid of some TABs, but also resulted
in some changed indentation).

Reformatted a big comment to fit to 80 columns.

Removed bogus references to "Linux".  (UNIX, and/or X11 were relavent,
and "UNIX/X11" was substituted for "Linux" in those places.  This includes
UNIX-alike systems.)

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@259 7f0cb862-5218-0410-a997-914c9d46530a