* lib/gserver.rb: remove redundant use of to_s in interpolation.
* lib/logger.rb: ditto.
* lib/optparse.rb: ditto.
* lib/rbconfig/obsolete.rb: ditto.
* lib/resolv.rb: ditto.
* lib/webrick/httpresponse.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46543 b2dd03c8-39d4-4d8f-98ff-823fe69b080e