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/requirements.sh

@@ -0,0 +1,17 @@
+#! /bin/sh
+
+source lib-cache.sh;
+
+module_name="$1";
+module_basename="${1//::/-}";
+
+print_requirements () {
+    module_name="$1";
+
+    ./retrieve-meta-yaml.sh "$module_name" |
+        sed -re '1,/^requires:/d; /^[a-z]/,$d; s@^\s*@@; s@:\s.*@@';
+    ./retrieve-meta-yaml.sh "$module_name" |
+        sed -re '1,/^build_requires:/d; /^[a-z]/,$d; s@^\s*@@; s@:\s.*@@';
+};
+
+cached_output print_requirements "$module_basename" "$module_name" "direct.deps";