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/display-managers/lightdm/gtk-greeter.nix

@@ -0,0 +1,79 @@
+{ lib, stdenv
+, lightdm_gtk_greeter
+, fetchurl
+, lightdm
+, pkg-config
+, intltool
+, linkFarm
+, wrapGAppsHook
+, useGTK2 ? false
+, gtk2
+, gtk3 # gtk3 seems better supported
+, xfce4-dev-tools
+, at-spi2-core
+, librsvg
+, hicolor-icon-theme
+}:
+
+#ToDo: bad icons with gtk2;
+#  avatar icon is missing in standard hicolor theme, I don't know where gtk3 takes it from
+
+let
+  ver_branch = "2.0";
+  version = "2.0.7";
+in
+stdenv.mkDerivation rec {
+  pname = "lightdm-gtk-greeter";
+  inherit version;
+
+  src = fetchurl {
+    url = "${meta.homepage}/${ver_branch}/${version}/+download/${pname}-${version}.tar.gz";
+    sha256 = "1g7wc3d3vqfa7mrdhx1w9ywydgjbffla6rbrxq9k3sc62br97qms";
+  };
+
+  nativeBuildInputs = [ pkg-config intltool xfce4-dev-tools wrapGAppsHook ];
+  buildInputs = [ lightdm librsvg hicolor-icon-theme ]
+    ++ (if useGTK2 then [ gtk2 ] else [ gtk3 ]);
+
+  configureFlags = [
+    "--localstatedir=/var"
+    "--sysconfdir=/etc"
+    "--disable-indicator-services-command"
+    "--sbindir=${placeholder "out"}/bin" # for wrapGAppsHook to wrap automatically
+  ] ++ lib.optional useGTK2 "--with-gtk2";
+
+  postPatch = ''
+    # exo-csource has been dropped from exo, and replaced by xdt-csource from xfce4-dev-tools
+    for f in configure.ac src/Makefile.am; do
+      substituteInPlace $f --replace exo-csource xdt-csource
+    done
+  '';
+
+  preConfigure = ''
+    configureFlagsArray+=( --enable-at-spi-command="${at-spi2-core}/libexec/at-spi-bus-launcher --launch-immediately" )
+  '';
+
+  NIX_CFLAGS_COMPILE = "-Wno-error=deprecated-declarations";
+
+  installFlags = [
+    "localstatedir=\${TMPDIR}"
+    "sysconfdir=${placeholder "out"}/etc"
+  ];
+
+  postInstall = ''
+    substituteInPlace "$out/share/xgreeters/lightdm-gtk-greeter.desktop" \
+      --replace "Exec=lightdm-gtk-greeter" "Exec=$out/bin/lightdm-gtk-greeter"
+  '';
+
+  passthru.xgreeters = linkFarm "lightdm-gtk-greeter-xgreeters" [{
+    path = "${lightdm_gtk_greeter}/share/xgreeters/lightdm-gtk-greeter.desktop";
+    name = "lightdm-gtk-greeter.desktop";
+  }];
+
+  meta = with lib; {
+    homepage = "https://launchpad.net/lightdm-gtk-greeter";
+    platforms = platforms.linux;
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ ];
+  };
+}