Fix path checks for case insensitive filesystem
see https://github.com/rubygems/rubygems/pull/2211 [ruby-core:86745] [Backport #14721]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@63809 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Fix path checks for case insensitive filesystem
see https://github.com/rubygems/rubygems/pull/2211
[ruby-core:86745] [Backport #14721]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@63809 b2dd03c8-39d4-4d8f-98ff-823fe69b080e