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/development/ruby-modules/bundled-common/functions.nix

@@ -0,0 +1,93 @@
+{ lib, gemConfig, ... }:
+
+let
+  inherit (lib) attrValues concatMap converge filterAttrs getAttrs
+                intersectLists;
+
+in rec {
+  bundlerFiles = {
+    gemfile ? null
+  , lockfile ? null
+  , gemset ? null
+  , gemdir ? null
+  , ...
+  }: {
+    inherit gemdir;
+
+    gemfile =
+    if gemfile == null then assert gemdir != null; gemdir + "/Gemfile"
+    else gemfile;
+
+    lockfile =
+    if lockfile == null then assert gemdir != null; gemdir + "/Gemfile.lock"
+    else lockfile;
+
+    gemset =
+    if gemset == null then assert gemdir != null; gemdir + "/gemset.nix"
+    else gemset;
+  };
+
+  filterGemset = { ruby, groups, ... }: gemset:
+    let
+      platformGems = filterAttrs (_: platformMatches ruby) gemset;
+      directlyMatchingGems = filterAttrs (_: groupMatches groups) platformGems;
+
+      expandDependencies = gems:
+        let
+          depNames = concatMap (gem: gem.dependencies or []) (attrValues gems);
+          deps = getAttrs depNames platformGems;
+        in
+          gems // deps;
+    in
+      converge expandDependencies directlyMatchingGems;
+
+  platformMatches = {rubyEngine, version, ...}: attrs: (
+  !(attrs ? platforms) ||
+  builtins.length attrs.platforms == 0 ||
+    builtins.any (platform:
+      platform.engine == rubyEngine &&
+        (!(platform ? version) || platform.version == version.majMin)
+    ) attrs.platforms
+  );
+
+  groupMatches = groups: attrs:
+    groups == null || !(attrs ? groups) ||
+      (intersectLists (groups ++ [ "default" ]) attrs.groups) != [];
+
+  applyGemConfigs = attrs:
+    (if gemConfig ? ${attrs.gemName}
+    then attrs // gemConfig.${attrs.gemName} attrs
+    else attrs);
+
+  genStubsScript = { lib, ruby, confFiles, bundler, groups, binPaths, ... }: ''
+      ${ruby}/bin/ruby ${./gen-bin-stubs.rb} \
+        "${ruby}/bin/ruby" \
+        "${confFiles}/Gemfile" \
+        "$out/${ruby.gemPath}" \
+        "${bundler}/${ruby.gemPath}/gems/bundler-${bundler.version}" \
+        ${lib.escapeShellArg binPaths} \
+        ${lib.escapeShellArg groups}
+    '';
+
+  pathDerivation = { gemName, version, path, ...  }:
+    let
+      res = {
+          type = "derivation";
+          bundledByPath = true;
+          name = gemName;
+          version = version;
+          outPath = "${path}";
+          outputs = [ "out" ];
+          out = res;
+          outputName = "out";
+        };
+    in res;
+
+  composeGemAttrs = ruby: gems: name: attrs: ((removeAttrs attrs ["platforms"]) // {
+    inherit ruby;
+    inherit (attrs.source) type;
+    source = removeAttrs attrs.source ["type"];
+    gemName = name;
+    gemPath = map (gemName: gems.${gemName}) (attrs.dependencies or []);
+  });
+}