* lib/cgi/core.rb: remove unused variables.
* lib/erb.rb: ditto.
* lib/mkmf.rb: ditto.
* lib/net/http/response.rb: ditto.
* lib/optparse/version.rb: ditto.
* lib/prime.rb: ditto.
* lib/racc/parser.rb: ditto.
* lib/rexml/document.rb: ditto.
* lib/rexml/dtd/dtd.rb: ditto.
* lib/rexml/element.rb: ditto.
* lib/rexml/functions.rb: ditto.
* lib/rexml/parsers/xpathparser.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46973 b2dd03c8-39d4-4d8f-98ff-823fe69b080e