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/xcape/default.nix

@@ -0,0 +1,41 @@
+{ lib, stdenv, fetchFromGitHub, pkg-config, libX11, libXtst, xorgproto,
+libXi }:
+
+stdenv.mkDerivation rec {
+  pname = "xcape";
+  version = "unstable-2018-03-01";
+
+  src = fetchFromGitHub {
+    owner = "alols";
+    repo = pname;
+    rev = "a34d6bae27bbd55506852f5ed3c27045a3c0bd9e";
+    sha256 = "04grs4w9kpfzz25mqw82zdiy51g0w355gpn5b170p7ha5972ykc8";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ libX11 libXtst xorgproto libXi ];
+
+  makeFlags = [
+    "PREFIX=$(out)"
+    "MANDIR=/share/man/man1"
+  ];
+
+  postInstall = "install -Dm444 --target-directory $out/share/doc README.md";
+
+  meta = with lib; {
+    description = "Utility to configure modifier keys to act as other keys";
+    longDescription = ''
+      xcape allows you to use a modifier key as another key when
+      pressed and released on its own.  Note that it is slightly
+      slower than pressing the original key, because the pressed event
+      does not occur until the key is released.  The default behaviour
+      is to generate the Escape key when Left Control is pressed and
+      released on its own.
+    '';
+    homepage = "https://github.com/alols/xcape";
+    license = licenses.gpl3 ;
+    maintainers = with maintainers; [ raskin ];
+    platforms = platforms.linux;
+  };
+}