gn: remove with lib; from meta

Signed-off-by: Marcin Serwin <[e-mail]>

pkgs/by-name/gn/gn/package.nix

···
 
   setupHook = ./setup-hook.sh;
 
-  meta = with lib; {
+  meta = {
     description = "Meta-build system that generates build files for Ninja";
     mainProgram = "gn";
     homepage = "https://gn.googlesource.com/gn";
-    license = licenses.bsd3;
-    platforms = platforms.unix;
-    maintainers = with maintainers; [
+    license = lib.licenses.bsd3;
+    platforms = lib.platforms.unix;
+    maintainers = with lib.maintainers; [
       stesie
       matthewbauer
     ];