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/build-support/make-startupitem/default.nix

@@ -0,0 +1,35 @@
+# given a pakcage with a $name.desktop file, makes a copy
+# as autostart item.
+
+{stdenv, lib}:
+{ name            # name of the desktop file (without .desktop)
+, package         # package where the desktop file resides in
+, srcPrefix ? ""  # additional prefix that the desktop file may have in the 'package'
+, after ? null
+, condition ? null
+, phase ? "2"
+}:
+
+# the builder requires that
+#   $package/share/applications/$name.desktop
+# exists as file.
+
+stdenv.mkDerivation {
+  name = "autostart-${name}";
+  priority = 5;
+
+  buildCommand = ''
+    mkdir -p $out/etc/xdg/autostart
+    target=${name}.desktop
+    cp ${package}/share/applications/${srcPrefix}${name}.desktop $target
+    chmod +rw $target
+    echo "X-KDE-autostart-phase=${phase}" >> $target
+    ${lib.optionalString (after != null) ''echo "${after}" >> $target''}
+    ${lib.optionalString (condition != null) ''echo "${condition}" >> $target''}
+    cp $target $out/etc/xdg/autostart
+  '';
+
+  # this will automatically put 'package' in the environment when you
+  # put its startup item in there.
+  propagatedBuildInputs = [ package ];
+}