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>

nixos/doc/manual/configuration/xfce.chapter.md

@@ -0,0 +1,52 @@
+# Xfce Desktop Environment {#sec-xfce}
+
+To enable the Xfce Desktop Environment, set
+
+```nix
+services.xserver.desktopManager.xfce.enable = true;
+services.xserver.displayManager.defaultSession = "xfce";
+```
+
+Optionally, *picom* can be enabled for nice graphical effects, some
+example settings:
+
+```nix
+services.picom = {
+  enable = true;
+  fade = true;
+  inactiveOpacity = 0.9;
+  shadow = true;
+  fadeDelta = 4;
+};
+```
+
+Some Xfce programs are not installed automatically. To install them
+manually (system wide), put them into your
+[](#opt-environment.systemPackages) from `pkgs.xfce`.
+
+## Thunar Plugins {#sec-xfce-thunar-plugins .unnumbered}
+
+If you\'d like to add extra plugins to Thunar, add them to
+[](#opt-services.xserver.desktopManager.xfce.thunarPlugins).
+You shouldn\'t just add them to [](#opt-environment.systemPackages).
+
+## Troubleshooting {#sec-xfce-troubleshooting .unnumbered}
+
+Even after enabling udisks2, volume management might not work. Thunar
+and/or the desktop takes time to show up. Thunar will spit out this kind
+of message on start (look at `journalctl --user -b`).
+
+```plain
+Thunar:2410): GVFS-RemoteVolumeMonitor-WARNING **: remote volume monitor with dbus name org.gtk.Private.UDisks2VolumeMonitor is not supported
+```
+
+This is caused by some needed GNOME services not running. This is all
+fixed by enabling \"Launch GNOME services on startup\" in the Advanced
+tab of the Session and Startup settings panel. Alternatively, you can
+run this command to do the same thing.
+
+```ShellSession
+$ xfconf-query -c xfce4-session -p /compat/LaunchGNOME -s true
+```
+
+A log-out and re-log will be needed for this to take effect.