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/development/perl-modules/expression-generator/retrieve-meta-yaml.sh

@@ -0,0 +1,16 @@
+#! /bin/sh
+
+source lib-cache.sh;
+
+print_meta_yaml () {
+    module_name="$1";
+    module_basename="${module_name//::/-}";
+
+    ./grab-url.sh "$(./retrieve-file-link.sh "$module_basename" "META.yml")" \
+        "${module_basename}.meta.yml";
+};
+
+module_name="$1";
+module_basename="${module_name//::/-}";
+
+cached_output print_meta_yaml "$module_basename" "$module_name" meta.yaml;