Ruby 1.9.1 p378 was released

Ruby 1.9.1 p376 was released because of WEBrick's vulnerability. So I download from here, and re-install it like this entry. Let's check.

> /opt/ruby-1.9.1/bin/ruby --version
ruby 1.9.1p378 (2010-01-10 revision 26273) [i686-linux]

Then I re-build QtRuby like this entry.