uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/games/minecraft-servers/default.nix

@@ -0,0 +1,24 @@
+{ callPackage, lib, javaPackages }:
+let
+  versions = lib.importJSON ./versions.json;
+
+  latestVersion = lib.last (builtins.sort lib.versionOlder (builtins.attrNames versions));
+  escapeVersion = builtins.replaceStrings [ "." ] [ "-" ];
+
+  getJavaVersion = v: (builtins.getAttr "openjdk${toString v}" javaPackages.compiler).headless;
+
+  packages = lib.mapAttrs'
+    (version: value: {
+      name = "vanilla-${escapeVersion version}";
+      value = callPackage ./derivation.nix {
+        inherit (value) version url sha1;
+        jre_headless = getJavaVersion (if value.javaVersion == null then 8 else value.javaVersion); # versions <= 1.6 will default to 8
+      };
+    })
+    versions;
+in
+lib.recurseIntoAttrs (
+  packages // {
+    vanilla = builtins.getAttr "vanilla-${escapeVersion latestVersion}" packages;
+  }
+)