configure.in: use the first candidate
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45509 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: use the first candidate
which works with __builtin_longjmp(). [Bug #9692]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45509 b2dd03c8-39d4-4d8f-98ff-823fe69b080e