Resolv::IPv6.create: avoid modifying frozen string literal
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53363 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Resolv::IPv6.create: avoid modifying frozen string literal
[Bug #11910] [ruby-core:72559]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53363 b2dd03c8-39d4-4d8f-98ff-823fe69b080e