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/servers/mail/petidomo/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchurl, flex, bison, sendmailPath ? "/run/wrappers/bin/sendmail" }:
+
+stdenv.mkDerivation rec {
+  pname = "petidomo";
+  version = "4.3";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/petidomo/${pname}-${version}.tar.gz";
+    sha256 = "0x4dbxc4fcfg1rw5ywpcypvylnzn3y4rh0m6fz4h4cdnzb8p1lvm";
+  };
+
+  buildInputs = [ flex bison ];
+
+  configureFlags = [ "--with-mta=${sendmailPath}" ];
+
+  enableParallelBuilding = true;
+
+  doCheck = true;
+
+  meta = {
+    homepage = "http://petidomo.sourceforge.net/";
+    description = "A simple and easy to administer mailing list server";
+    license = lib.licenses.gpl3Plus;
+
+    platforms = lib.platforms.unix;
+    maintainers = [ lib.maintainers.peti ];
+  };
+}