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/compilers/elm/makeDotElm.nix

@@ -0,0 +1,35 @@
+{stdenv, lib, fetchurl, registryDat}:
+
+ver: deps:
+  let cmds = lib.mapAttrsToList (name: info: let
+               pkg = stdenv.mkDerivation {
+                 name = lib.replaceChars ["/"] ["-"] name + "-${info.version}";
+
+                 src = fetchurl {
+                   url = "https://github.com/${name}/archive/${info.version}.tar.gz";
+                   meta.homepage = "https://github.com/${name}/";
+                   inherit (info) sha256;
+                 };
+
+                 configurePhase = ''
+                   true
+                 '';
+
+                 buildPhase = ''
+                   true
+                 '';
+
+                 installPhase = ''
+                   mkdir -p $out
+                   cp -r * $out
+                 '';
+               };
+             in ''
+               mkdir -p .elm/${ver}/packages/${name}
+               cp -R ${pkg} .elm/${ver}/packages/${name}/${info.version}
+             '') deps;
+  in (lib.concatStrings cmds) + ''
+    mkdir -p .elm/${ver}/packages;
+    cp ${registryDat} .elm/${ver}/packages/registry.dat;
+    chmod -R +w .elm
+  ''