* ext/-test-/**/extconf.rb: bring up extension libraries which
have same name as the parent directory to reduce feature names.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53494 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
constant of the path is not defined but defined on toplevel.
[ruby-core:41410] [Bug #5691]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33909 b2dd03c8-39d4-4d8f-98ff-823fe69b080e