Update ruby package to 1.8.1.

Now, this package isn't meta-package.

Ruby itself is provided as language/ruby18 (Ruby 1.8.1) or
language/ruby16 (Ruby 1.6.8) and Ruby's commands are
$PREFIX/bin/ruby18 or $PREFIX/bin/ruby16.

This pacakge provide commands without its version in name
as $PREFIX/bin/ruby.

Some extention libraries bundled in Ruby's distribution are
move to separate packages.  For ruby18:

	converters/ruby-iconv:		Iconv module
	databases/ruby-dbm:		DBM module
	databases/ruby-gdbm:		GDBM module
	devel/ruby-curses:		Curses module
	security/ruby-digest:		message digest module
	security/ruby-openssl:		OpenSSL module
	devel/ruby-readline:		readline module
	x11/ruby-tcltklib:		Tcl/Tk libraries
	x11/ruby-tk:			Tk modules

And for ruby16:

	databases/ruby-dbm:		DBM module
	databases/ruby-gdbm:		GDBM module
	devel/ruby16-curses:		Curses module
	security/ruby-digest:		message digest module
	devel/ruby-readline:		readline module
	x11/ruby16-tcltklib:		Tcl/Tk libraries
	x11/ruby16-tk:			Tk modules

You can specify default Ruby's version by setting
RUBY_VERSION_DEFAULT to 1.6 or 1.8 in /etc/mk.conf.

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