update requirements on externals
This patch fixes several compiler errors and warnings seen with gcc-6.2.
Fixes ACTS-206, closes ACTS-247
AI coding assistants: please let us know about your needs, preferences and usage - fill in this survey: https://forms.office.com/e/axzFvLryse. Thanks for your participation!
This patch fixes several compiler errors and warnings seen with gcc-6.2.
Fixes ACTS-206, closes ACTS-247