fiddle: append libffi config.log
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49070 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fiddle: append libffi config.log
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49070 b2dd03c8-39d4-4d8f-98ff-823fe69b080e