how did this thing disappear, is this even working then?

restore the library file removed in 
https://github.com/aws/opsworks-cookbooks/commit/8808a87ce7ad5b9d7dde322c6be2d082efcaffe1

I believe this has been ok because opsworks-custom-cookbooks is called with
`include_recipe "opsworks-custom-cookbooks::execute"` or something or other...