Replace non-loop usage of atomic_compare_exchange_weak with strong variant

Replace non-loop usage of atomic_compare_exchange_weak with strong variant

While testing BIND 9 on arm64 8+ core machine, it was discovered that
the weak variants in fact does spuriously fail, we haven't observed that
on other architectures.

This commit replaces all non-loop usage of atomic_compare_exchange_weak
with atomic_compare_exchange_strong.