xfontsel: minor formatting

pkgs/applications/misc/xfontsel/default.nix

···
 # That is why this expression is not inside pkgs.xorg
 
 { lib, stdenv, fetchurl, makeWrapper, libX11, pkg-config, libXaw }:
+
 stdenv.mkDerivation rec {
   pname = "xfontsel";
   version = "1.0.6";
···
   };
 
   nativeBuildInputs = [ pkg-config makeWrapper ];
+
   buildInputs = [ libX11 libXaw ];
 
   # Without this, it gets Xmu as a dependency, but without rpath entry
···
       --set XAPPLRESDIR $out/share/X11/app-defaults
   '';
 
-  meta = {
+  meta = with lib; {
     homepage = "https://www.x.org/";
     description = "Allows testing the fonts available in an X server";
-    license = lib.licenses.free;
-    maintainers = with lib.maintainers; [ viric ];
-    platforms = with lib.platforms; linux ++ darwin;
+    license = licenses.free;
+    maintainers = with maintainers; [ viric ];
+    platforms = platforms.unix;
   };
 }