Log Message:
Update Ruby to 1.8.5 (+ ruby-1-8 branch on 2006-09-07).

pkgsrc changes:

* Add RUBY_DYNAMIC_DIRS which cause generating dynamic PLIST entries.
* Move using buildlinks to rubyversion.mk.
* Merge converters/ruby-iconv to ruby18-base.

Ruby changes:

* too may, see ChangeLog file or
  http://eigenclass.org/hiki.rb?ruby+1.8.5+changelog