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/misc/xkbmon/default.nix

@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchFromGitHub, libX11 }:
+
+stdenv.mkDerivation rec {
+  pname = "xkbmon";
+  version = "0.4";
+
+  src = fetchFromGitHub {
+    owner = "xkbmon";
+    repo = "xkbmon";
+    rev = version;
+    sha256 = "sha256-EWW6L6NojzXodDOET01LMcQT8/1JIMpOD++MCiM3j1Y=";
+  };
+
+  buildInputs = [ libX11 ];
+
+  installPhase = "install -D -t $out/bin xkbmon";
+
+  meta = with lib; {
+    homepage = "https://github.com/xkbmon/xkbmon";
+    description = "Command-line keyboard layout monitor for X11";
+    license = licenses.mit;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.romildo ];
+  };
+}