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/plugins/discourse-prometheus/no-git-version.patch

@@ -0,0 +1,36 @@
+diff --git a/lib/internal_metric/global.rb b/lib/internal_metric/global.rb
+index 682571b..7bdd431 100644
+--- a/lib/internal_metric/global.rb
++++ b/lib/internal_metric/global.rb
+@@ -30,30 +30,7 @@ module DiscoursePrometheus::InternalMetric
+       @active_app_reqs = 0
+       @queued_app_reqs = 0
+       @fault_logged = {}
+-
+-      begin
+-        @@version = nil
+-
+-        out, error, status = Open3.capture3('git rev-parse HEAD')
+-
+-        if status.success?
+-          @@version ||= out.chomp
+-        else
+-          raise error
+-        end
+-      rescue => e
+-        if defined?(::Discourse)
+-          Discourse.warn_exception(e, message: "Failed to calculate discourse_version_info metric")
+-        else
+-          STDERR.puts "Failed to calculate discourse_version_info metric: #{e}\n#{e.backtrace.join("\n")}"
+-        end
+-
+-        @@retries ||= 10
+-        @@retries -= 1
+-        if @@retries < 0
+-          @@version = -1
+-        end
+-      end
++      @@version = -1
+     end
+ 
+     def collect