Add script to sniff out RUBY_PLATFORM strings.
Add script to sniff out RUBY_PLATFORM strings.

thomthom/ruby-c-extension-examples,SketchUp/ruby-c-extension-examples,thomthom/ruby-c-extension-examples,SketchUp/ruby-c-extension-examples,SketchUp/ruby-c-extension-examples,thomthom/ruby-c-extension-examples