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/from_md/configuration/firewall.section.xml

@@ -0,0 +1,39 @@
+<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-firewall">
+  <title>Firewall</title>
+  <para>
+    NixOS has a simple stateful firewall that blocks incoming
+    connections and other unexpected packets. The firewall applies to
+    both IPv4 and IPv6 traffic. It is enabled by default. It can be
+    disabled as follows:
+  </para>
+  <programlisting language="bash">
+networking.firewall.enable = false;
+</programlisting>
+  <para>
+    If the firewall is enabled, you can open specific TCP ports to the
+    outside world:
+  </para>
+  <programlisting language="bash">
+networking.firewall.allowedTCPPorts = [ 80 443 ];
+</programlisting>
+  <para>
+    Note that TCP port 22 (ssh) is opened automatically if the SSH
+    daemon is enabled
+    (<literal>services.openssh.enable = true</literal>). UDP ports can
+    be opened through
+    <xref linkend="opt-networking.firewall.allowedUDPPorts" />.
+  </para>
+  <para>
+    To open ranges of TCP ports:
+  </para>
+  <programlisting language="bash">
+networking.firewall.allowedTCPPortRanges = [
+  { from = 4000; to = 4007; }
+  { from = 8000; to = 8010; }
+];
+</programlisting>
+  <para>
+    Similarly, UDP port ranges can be opened through
+    <xref linkend="opt-networking.firewall.allowedUDPPortRanges" />.
+  </para>
+</section>