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/numlockx/default.nix

@@ -0,0 +1,21 @@
+{ lib, stdenv, fetchFromGitHub, libX11, libXext, autoconf }:
+
+stdenv.mkDerivation rec {
+  version = "1.2";
+  pname = "numlockx";
+
+  src = fetchFromGitHub {
+    owner = "rg3";
+    repo = pname;
+    rev = "9159fd3c5717c595dadfcb33b380a85c88406185";
+    sha256 = "1w49fayhwzn5rx0z1q2lrvm7z8jrd34lgb89p853a024bixc3cf2";
+  };
+
+  buildInputs = [ libX11 libXext autoconf ];
+
+  meta = with lib; {
+    description = "Allows to start X with NumLock turned on";
+    license = licenses.mit;
+    platforms = platforms.all;
+  };
+}