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/keynav/default.nix

@@ -0,0 +1,62 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, pkg-config
+, libX11
+, xorgproto
+, libXtst
+, libXi
+, libXext
+, libXinerama
+, libXrandr
+, glib
+, cairo
+, xdotool
+}:
+
+let release = "20180821"; in
+stdenv.mkDerivation {
+  pname = "keynav";
+  version = "0.${release}.0";
+
+  src = fetchFromGitHub {
+    owner = "jordansissel";
+    repo = "keynav";
+    rev = "78f9e076a5618aba43b030fbb9344c415c30c1e5";
+    sha256 = "0hmc14fj612z5h7gjgk95zyqab3p35c4a99snnblzxfg0p3x2f1d";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [
+    libX11
+    xorgproto
+    libXtst
+    libXi
+    libXext
+    libXinerama
+    libXrandr
+    glib
+    cairo
+    xdotool
+  ];
+
+  postPatch = ''
+    echo >>VERSION MAJOR=0
+    echo >>VERSION RELEASE=${release}
+    echo >>VERSION REVISION=0
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin $out/share/keynav/doc
+    cp keynav $out/bin
+    cp keynavrc $out/share/keynav/doc
+  '';
+
+  meta = with lib; {
+    description = "Generate X11 mouse clicks from keyboard";
+    homepage = "https://www.semicomplete.com/projects/keynav/";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ pSub ];
+    platforms = platforms.linux;
+  };
+}