etl

93d9df9c - Automatically set ETL_HAS_ATOMIC if __STDC_NO_ATOMICS__ defined by compiler. (#624)

Automatically set ETL_HAS_ATOMIC if __STDC_NO_ATOMICS__ defined by compiler. (#624) Reference: https://en.cppreference.com/w/c/atomic Co-authored-by: Jeremy Erdmann <jeremy.erdmann@millerwelds.com>