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/installation/installing-behind-a-proxy.section.xml

@@ -0,0 +1,41 @@
+<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-installing-behind-proxy">
+  <title>Installing behind a proxy</title>
+  <para>
+    To install NixOS behind a proxy, do the following before running
+    <literal>nixos-install</literal>.
+  </para>
+  <orderedlist numeration="arabic">
+    <listitem>
+      <para>
+        Update proxy configuration in
+        <literal>/mnt/etc/nixos/configuration.nix</literal> to keep the
+        internet accessible after reboot.
+      </para>
+      <programlisting language="bash">
+networking.proxy.default = &quot;http://user:password@proxy:port/&quot;;
+networking.proxy.noProxy = &quot;127.0.0.1,localhost,internal.domain&quot;;
+</programlisting>
+    </listitem>
+    <listitem>
+      <para>
+        Setup the proxy environment variables in the shell where you are
+        running <literal>nixos-install</literal>.
+      </para>
+      <programlisting>
+# proxy_url=&quot;http://user:password@proxy:port/&quot;
+# export http_proxy=&quot;$proxy_url&quot;
+# export HTTP_PROXY=&quot;$proxy_url&quot;
+# export https_proxy=&quot;$proxy_url&quot;
+# export HTTPS_PROXY=&quot;$proxy_url&quot;
+</programlisting>
+    </listitem>
+  </orderedlist>
+  <note>
+    <para>
+      If you are switching networks with different proxy configurations,
+      use the <literal>specialisation</literal> option in
+      <literal>configuration.nix</literal> to switch proxies at runtime.
+      Refer to <xref linkend="ch-options" /> for more information.
+    </para>
+  </note>
+</section>