Update the remark on opengl libraries

doc/gmsh.html

@@ -215,17 +215,14 @@ are included in the archives.
 Older versions are still available <A href="/gmsh/bin/">here</a>.
 
 <p>
-<a name="opengl-footnote"></a><a
-href="#opengl-footmark"><sup>1</sup></a>For Unix versions only: you
+<a name="opengl-footnote"></a><a href="#opengl-footmark"><sup>1</sup></a>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 <A
-href="http://mesa3d.sourceforge.net">http://mesa3d.sourceforge.net</A>
-(a Linux RPM is directly available <A
-href="/gmsh/thirdparty/Mesa-3.2-2.i386.rpm">here</A>).  Remember that
-you may have to reconfigure the loader (ldconfig under Linux) or
-modify the LD_LIBRARY_PATH (or SHLIB_PATH on HP) environment variable
-in order for Gmsh to find the libraries.
+at <A href="http://mesa3d.sourceforge.net">http://mesa3d.sourceforge.net</A>
+(a Linux RPM is directly available <A href="/gmsh/thirdparty/Mesa-3.2-2.i386.rpm">here</A>).
+Remember that you may have to reconfigure the loader (ldconfig under
+Linux) or modify the LD_LIBRARY_PATH (or SHLIB_PATH on HP) environment
+variable in order for Gmsh to find the libraries.
 <!--
 <p>
 <a name="fltk-footnote"></a><a