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/source-download-link.sh

@@ -0,0 +1,17 @@
+#! /bin/sh
+
+source lib-cache.sh;
+
+module_name="$1";
+module_basename="${module_name//::/-}";
+
+write_link() {
+    module_basename="$1";
+
+    ./retrieve-modulepage.sh "$module_basename" |
+        grep -A 2 "This Release" |
+        grep href |
+        sed -re 's/.*href="//; s/".*//; s@^/@http://search.cpan.org/@';
+}
+
+cached_output write_link "$module_basename" "$module_basename" src.link;