* Narrow ocaml platforms to linux and darwin

svn path=/nixpkgs/trunk/; revision=25062

pkgs/development/compilers/ocaml/3.11.1.nix

···
          documentation generator (ocamldoc).
        '';
 
-    platforms = stdenv.lib.platforms.all;
+    platforms = stdenv.lib.platforms.linux ++ stdenv.lib.platforms.darwin;
     maintainers = [
       stdenv.lib.maintainers.z77z
     ];