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/nullmailer/default.nix

@@ -0,0 +1,51 @@
+{ stdenv, fetchurl, lib, tls ? true, gnutls ? null }:
+
+assert tls -> gnutls != null;
+
+stdenv.mkDerivation rec {
+
+  version = "2.2";
+  pname = "nullmailer";
+
+  src = fetchurl {
+    url = "https://untroubled.org/nullmailer/nullmailer-${version}.tar.gz";
+    sha256 = "0md8cf90fl2yf3zh9njjy42a673v4j4ygyq95xg7fzkygdigm1lq";
+  };
+
+  buildInputs = lib.optional tls gnutls;
+
+  configureFlags = [
+    "--sysconfdir=/etc"
+    "--localstatedir=/var"
+  ] ++ lib.optional tls "--enable-tls";
+
+  installFlags = [ "DESTDIR=$(out)" ];
+
+  # We have to remove the ''var'' directory, since nix can't handle named pipes
+  # and we can't use it in the store anyway. Same for ''etc''.
+  # The second line is need, because the installer of nullmailer will copy its
+  # own prepared version of ''etc'' and ''var'' and also uses the prefix path (configure phase)
+  # for hardcoded absolute references to its own binary farm, e.g. sendmail binary is
+  # calling nullmailer-inject binary. Since we can't configure inside the store of
+  # the derivation we need both directories in the root, but don't want to put them there
+  # during install, hence we have to fix mumbling inside the install directory.
+  # This is kind of a hack, but the only way I know of, yet.
+  postInstall = ''
+    rm -rf $out/var/ $out/etc/
+    mv $out/$out/* $out/
+    rmdir $out/$out
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = {
+    homepage = "http://untroubled.org/nullmailer/";
+    description = ''
+      A sendmail/qmail/etc replacement MTA for hosts which relay to a fixed set of smart relays.
+      It is designed to be simple to configure, secure, and easily extendable.
+    '';
+    license = lib.licenses.gpl2;
+    platforms = lib.platforms.all;
+    maintainers = with lib.maintainers ; [ sargon ];
+  };
+}