treewide: remove enableParallelBuilding = true if using cmake

pkgs/games/riko4/default.nix

@@ -15,7 +15,6 @@ let
     };
     buildInputs = [ SDL2 libGLU ];
     nativeBuildInputs = [ cmake ];
-    enableParallelBuilding = true;
 
     meta = with stdenv.lib; {
       homepage = "https://github.com/grimfang4/sdl-gpu";
@@ -57,8 +56,6 @@ stdenv.mkDerivation rec {
     chmod +x $out/bin/riko4
   '';
 
-  enableParallelBuilding = true;
-
   meta = with stdenv.lib; {
     homepage = "https://github.com/incinirate/Riko4";
     description = "Fantasy console for pixel art game development";