Remove native functions from rule 4

[gvwilson]

Reviewer 3: Rule 4 also tends to stuff multiple rules (bolded) into one rule (( limit dependencies, ensure dependencies are available) these 2 are closely related), with “use native functions” which is a very different idea and not what I would expect from a ‘reuse’ rule.

[morgantaschuk]

Rule 4 also tends to stuff multiple rules (bolded) into one rule
(( limit dependencies, ensure dependencies are available) these
2 are closely related), with “ use native functions” which is a very
different idea and not what I would expect from a ‘reuse’ rule.

I think this is addressed with the changes made for #31