pkgs/applications/editors/emacs-{22,23}: don't restrict this build to Linux

It looks like the recent update broke the package on all platforms other than
Linux, but no-one seems to have noticed. Hydra certainly didn't. That's not
particularly satisfactory. Surely, we would like Emacs to build on Darwin, BSD,
and other platforms, too?

svn path=/nixpkgs/trunk/; revision=21773

pkgs/applications/editors/emacs-22/default.nix

@@ -43,6 +43,6 @@ stdenv.mkDerivation rec {
     homepage = http://www.gnu.org/software/emacs/;
     license = "GPLv3+";
 
-    platforms = stdenv.lib.platforms.linux;  # GTK & co. are needed.
+    platforms = stdenv.lib.platforms.all;
   };
 }

pkgs/applications/editors/emacs-23/default.nix

@@ -69,6 +69,6 @@ stdenv.mkDerivation rec {
     license = "GPLv3+";
 
     maintainers = [ stdenv.lib.maintainers.ludo ];
-    platforms = stdenv.lib.platforms.linux;  # GTK & co. are needed.
+    platforms = stdenv.lib.platforms.all;
   };
 }