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/applications/window-managers/taffybar/default.nix

@@ -0,0 +1,29 @@
+{ lib, stdenv, ghcWithPackages, taffybar, makeWrapper, packages ? (x: []) }:
+
+let
+  taffybarEnv = ghcWithPackages (self: [
+    self.taffybar
+  ] ++ packages self);
+in stdenv.mkDerivation {
+  pname = "taffybar-with-packages";
+  inherit (taffybarEnv) version;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  buildCommand = ''
+    mkdir -p $out/bin
+    makeWrapper ${taffybarEnv}/bin/taffybar $out/bin/taffybar \
+      --set NIX_GHC "${taffybarEnv}/bin/ghc"
+  '';
+
+  # Trivial derivation
+  preferLocalBuild = true;
+  allowSubstitutes = false;
+
+  # For hacking purposes
+  passthru.env = taffybarEnv;
+  buildInputs = [ taffybarEnv ];
+  shellHook = "eval $(egrep ^export ${taffybarEnv}/bin/ghc)";
+
+  inherit (taffybar) meta;
+}