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/web-apps/discourse/notification_email.patch

@@ -0,0 +1,18 @@
+diff --git a/db/fixtures/990_settings.rb b/db/fixtures/990_settings.rb
+deleted file mode 100644
+index 6f21e58813..0000000000
+--- a/db/fixtures/990_settings.rb
++++ /dev/null
+@@ -1,12 +0,0 @@
+-# frozen_string_literal: true
+-
+-if SiteSetting.notification_email == SiteSetting.defaults[:notification_email]
+-  # don't crash for invalid hostname, which is possible in dev
+-  begin
+-    SiteSetting.notification_email = "noreply@#{Discourse.current_hostname}"
+-  rescue Discourse::InvalidParameters
+-    if Rails.env.production?
+-      STDERR.puts "WARNING: Discourse hostname: #{Discourse.current_hostname} is not a valid domain for emails!"
+-    end
+-  end
+-end