configure.in: target_os suffix
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39334 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: target_os suffix
--target is given explicitly. [Bug #7874]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39334 b2dd03c8-39d4-4d8f-98ff-823fe69b080e