Log Message:
Update archivers/ruby-zip package to 0.9.4.

* Use lang/ruby/gem.mk.

= Version 0.9.4

Changed ZipOutputStream.put_next_entry signature (API CHANGE!). Now
allows comment, extra field and compression method to be specified.

= Version 0.9.3

Fixed: Added ZipEntry::name_encoding which retrieves the character
encoding of the name and comment of the entry. Also added convenience
methods ZipEntry::name_in(enc) and ZipEntry::comment_in(enc) for
getting zip entry names and comments in a specified character
encoding.

= Version 0.9.2

Fixed: Renaming an entry failed if the entry's new name was a
different length than its old name. (Diego Barros)