Suggesting marking converter/ruby-iconv as IGNORE with ruby20

[Koichiro IWAO]

Iconv library was removed after Ruby 2.0.
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/50443

IMHO, converters/ruby-iconv should be marked as IGNORE or something
suitable when RUBY_VER==2.0. It just fails "no such file or directory"
at this moment.

# cd /usr/ports/converters/ruby-iconv
# make -VRUBY_VER
2.0
# make install
(snip)
===>  Configuring for ruby20-iconv-2.0.0.195,1
===>  Running extconf.rb to configure
cd: /usr/ports/converters/ruby-iconv/work/iconv:
No such file or directory
*** [ruby-extconf-configure] Error code 2

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