wlcs: use tag and remove with lib

pkgs/by-name/wl/wlcs/package.nix

···
   src = fetchFromGitHub {
     owner = "MirServer";
     repo = "wlcs";
-    rev = "v${finalAttrs.version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-W4/a7neFcaqdPIAWDk5TcIuIWZ76rC7xCk3beJVqE/E=";
   };
 
···
     };
   };
 
-  meta = with lib; {
+  meta = {
     description = "Wayland Conformance Test Suite";
     longDescription = ''
       wlcs aspires to be a protocol-conformance-verifying test suite usable by Wayland
···
     '';
     homepage = "https://github.com/MirServer/wlcs";
     changelog = "https://github.com/MirServer/wlcs/releases/tag/v${finalAttrs.version}";
-    license = licenses.gpl3Only;
-    maintainers = with maintainers; [ OPNA2608 ];
-    platforms = platforms.linux;
+    license = lib.licenses.gpl3Only;
+    maintainers = with lib.maintainers; [ OPNA2608 ];
+    platforms = lib.platforms.linux;
     pkgConfigModules = [
       "wlcs"
     ];