[ruby/irb] Bump version to 1.7.1 (https://github.com/ruby/irb/pull/621)
https://github.com/ruby/irb/commit/b9a9dd97df
[ruby/irb] Bump version to 1.7.1
(https://github.com/ruby/irb/pull/621)
https://github.com/ruby/irb/commit/b9a9dd97df