Revert "Update stdlib to 4.2.1"

This reverts commit 86732a39508458767755f63d81507b406f7f6109.

Was merged with out being a clean commit + commit for fixes per
http://docs.mirantis.com/fuel-dev/develop/module_structure.html#adding-new-modules-to-fuel-library

Please resubmit using guide above

Change-Id: Ic64086af679ac556b0467776a39da50be7c571fa