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/spec-import-fix-abi-version.patch

@@ -0,0 +1,16 @@
+diff --git a/bin/collector b/bin/collector
+index 4fec65e..e59eac7 100755
+--- a/bin/collector
++++ b/bin/collector
+@@ -3,8 +3,10 @@
+ 
+ Process.setproctitle("discourse prometheus-collector")
+ 
++# We need the ABI version {MAJOR}.{MINOR}.0 here.
++abi_version = ENV['GEM_PATH'].split("/")[-1]
+ version = File.read(File.expand_path("../../prometheus_exporter_version", __FILE__)).strip
+-spec_file = File.expand_path("../../gems/#{RUBY_VERSION}/specifications/prometheus_exporter-#{version}.gemspec", __FILE__)
++spec_file = File.expand_path("../../gems/#{abi_version}/specifications/prometheus_exporter-#{version}.gemspec", __FILE__)
+ 
+ spec = Gem::Specification.load spec_file
+ spec.activate