configure.in: suppress warnings
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53594 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: suppress warnings
expansion with clang (and maybe -save-temps option).
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53594 b2dd03c8-39d4-4d8f-98ff-823fe69b080e