configure.in: exit with failure
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46796 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: exit with failure
normally, no needs to abort. [ruby-core:63678] [Bug #10008]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46796 b2dd03c8-39d4-4d8f-98ff-823fe69b080e