openttd{,-jgrpp,-grfcodec,nml}: move to pkgs/by-name

this shouldn't create any rebuilds

pkgs/by-name/op/openttd-jgrpp/package.nix

@@ -2,7 +2,6 @@
   fetchFromGitHub,
   openttd,
   zstd,
-  ...
 }:
 
 openttd.overrideAttrs (oldAttrs: rec {

pkgs/by-name/op/openttd/package.nix

@@ -8,6 +8,7 @@
   SDL2,
   libpng,
   zlib,
+  zlib' ? zlib.override { static = true; },
   xz,
   freetype,
   fontconfig,
@@ -87,7 +88,7 @@ stdenv.mkDerivation (finalAttrs: {
     SDL2
     libpng
     xz
-    zlib
+    zlib'
     freetype
     fontconfig
     curl

pkgs/top-level/all-packages.nix

@@ -12345,19 +12345,6 @@ with pkgs;
 
   openra = openraPackages.engines.release;
 
-  openttd = callPackage ../games/openttd {
-    zlib = zlib.override {
-      static = true;
-    };
-  };
-  openttd-jgrpp = callPackage ../games/openttd/jgrpp.nix {
-    zlib = zlib.override {
-      static = true;
-    };
-  };
-  openttd-grfcodec = callPackage ../games/openttd/grfcodec.nix { };
-  openttd-nml = callPackage ../games/openttd/nml.nix { };
-
   openxray = callPackage ../games/openxray {
     # Builds with Clang, but hits an assertion failure unless GCC is used
     # https://github.com/OpenXRay/xray-16/issues/1224