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/tools/misc/grc/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, fetchFromGitHub
+, buildPythonApplication
+}:
+
+buildPythonApplication rec {
+  pname = "grc";
+  version = "1.13";
+  format = "other";
+
+  src = fetchFromGitHub {
+    owner = "garabik";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1h0h88h484a9796hai0wasi1xmjxxhpyxgixn6fgdyc5h69gv8nl";
+  };
+
+  postPatch = ''
+    for f in grc grcat; do
+      substituteInPlace $f \
+        --replace /usr/local/ $out/
+    done
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    ./install.sh "$out" "$out"
+    install -Dm444 -t $out/share/zsh/vendor-completions _grc
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    homepage = "http://kassiopeia.juls.savba.sk/~garabik/software/grc.html";
+    description = "A generic text colouriser";
+    longDescription = ''
+      Generic Colouriser is yet another colouriser (written in Python) for
+      beautifying your logfiles or output of commands.
+    '';
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ lovek323 AndersonTorres peterhoeg ];
+    platforms = platforms.unix;
+  };
+}