Fix platform guard in Float#round spec
Fix platform guard in Float#round spec

ruby/spec,ruby/rubyspec,eregon/rubyspec,eregon/rubyspec,ruby/rubyspec,ruby/spec,ruby/spec,sgarciac/spec,sgarciac/spec,sgarciac/spec,nobu/rubyspec,nobu/rubyspec,eregon/rubyspec,nobu/rubyspec