configure.in: -Werror=division-by-zero
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43704 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: -Werror=division-by-zero
RUBY_CONST_ASSERT macro.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43704 b2dd03c8-39d4-4d8f-98ff-823fe69b080e