Fully reproducible dev environment (OpenRCT2#8017)

* Add nix shell

* Delete unused assignment

* Delete comment from wihc unstalbe this is

* fix name

* Attempt to make it build on OSX

* Full path  to foundation and appkit

* This also works with nix-build

shell.nix

@@ -0,0 +1,70 @@
+{ pkgs ? (
+   let 
+    hostPkgs = import <nixpkgs> {};
+    pinnedPkgs = hostPkgs.fetchFromGitHub {
+      owner = "NixOS";
+      repo = "nixpkgs-channels";
+      rev = "08d245eb31a3de0ad73719372190ce84c1bf3aee";
+      sha256 = "1g22f8r3l03753s67faja1r0dq0w88723kkfagskzg9xy3qs8yw8";
+    };
+  in
+  import pinnedPkgs {}
+ )
+}:
+let
+  objects-src = pkgs.fetchFromGitHub {
+    owner = "OpenRCT2";
+    repo = "objects";
+    rev = "v1.0.6";
+    sha256 = "1yhyafsk2lyasgj1r7h2n4k7vp5q792aj86ggpbmd6bcp4kk6hbm";
+  };
+
+  title-sequences-src = pkgs.fetchFromGitHub {
+    owner = "OpenRCT2";
+    repo = "title-sequences";
+    rev = "v0.1.2";
+    sha256 = "1yb1ynkfmiankii3fngr9km5wbc07rp30nh0apkj6wryrhy7imgm";
+};
+in
+pkgs.stdenv.mkDerivation {
+  name = "openrct2";
+  src = ./.;
+
+  cmakeFlags = [
+    "-DCMAKE_BUILD_TYPE=RELWITHDEBINFO"
+    "-DDOWNLOAD_OBJECTS=OFF"
+    "-DDOWNLOAD_TITLE_SEQUENCES=OFF"
+  ];
+
+  postUnpack = ''
+    cp -r ${objects-src}         $sourceRoot/data/object
+    cp -r ${title-sequences-src} $sourceRoot/data/title
+  '';
+  preFixup = "ln -s $out/share/openrct2 $out/bin/data";
+
+
+  makeFlags = ["all" "g2"];
+
+  buildInputs = [
+	pkgs.SDL2
+	pkgs.cmake
+	pkgs.curl
+	pkgs.fontconfig
+	pkgs.freetype
+	pkgs.icu
+	pkgs.jansson
+  pkgs.libiconv
+  pkgs.libpng
+	pkgs.libGLU
+	pkgs.libzip
+	pkgs.openssl
+	pkgs.pkgconfig
+	pkgs.speexdsp
+	pkgs.xorg.libpthreadstubs
+	pkgs.zlib
+] ++ (pkgs.stdenv.lib.optionals pkgs.stdenv.isDarwin [
+    pkgs.darwin.apple_sdk.frameworks.Foundation # osX hacks
+    pkgs.darwin.apple_sdk.frameworks.AppKit
+    pkgs.darwin.libobjc ]
+  );
+}