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/X11/xcalib/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchFromGitHub, libX11, libXxf86vm, libXext, libXrandr }:
+
+stdenv.mkDerivation rec {
+  pname = "xcalib";
+  version = "0.10";
+
+  src = fetchFromGitHub {
+    owner = "OpenICC";
+    repo = "xcalib";
+    rev = version;
+    sha256 = "05fzdjmhiafgi2jf0k41i3nm0837a78sb6yv59cwc23nla8g0bhr";
+  };
+
+  buildInputs = [ libX11 libXxf86vm libXext libXrandr ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp xcalib $out/bin/
+  '';
+
+  meta = with lib; {
+    inherit (src.meta) homepage;
+    description = "A tiny monitor calibration loader for X and MS-Windows";
+    license = licenses.gpl2;
+    maintainers = [];
+    platforms = platforms.linux;
+  };
+}