update OpenGL entry

doc/FAQ

-GMSH FREQUENTLY ASKED QUESTIONS ($Date: 2002-09-09 17:22:29 $)
+GMSH FREQUENTLY ASKED QUESTIONS ($Date: 2002-10-24 17:04:45 $)
 
 1. GENERAL
 ==========
@@ -35,11 +35,10 @@ Windows 95/98/NT/2000, Linux (with glibc > 2.1), Compaq Tru 64 Unix
 
 2.2) Are there additional requirements to run Gmsh?
 
-For Unix versions only: you should have the OpenGL libraries installed
-on your system, and in the path of the library loader. A free
-replacement for OpenGL can be found at <http://www.mesa3d.org>. For
-Windows versions: please read the README.txt file included in the
-distribution.
+You should have the OpenGL libraries installed on your system, and in
+the path of the library loader. A free replacement for OpenGL can be
+found at <http://www.mesa3d.org>. For Windows versions: please read
+the README.txt file included in the distribution.
 
 
 3. GENERAL PROBLEMS