Change the default version of ruby to 1.8 for i386 as well, finally.
Always put a version suffix to the ruby name (no matter if ruby is the
default version) to avoid mess in future.
[Notes for i386 users]
If you are a ruby developer and still want to stick with ruby 1.6 as
default, please add RUBY_DEFAULT_VER=1.6 to /etc/make.conf.
If you are a ruby developer and want to keep ruby 1.6 as default,
please add RUBY_DEFAULT_VER=1.6 to /etc/make.conf. Otherwise, please
run the following series of commands to migrate to ruby 1.8:
1) Reinstall portupgrade manually (and ruby 1.8 will be installed)
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