fix: nil: Use links() for checking if -latomic is necessary

Use the links() method instead of compiles() for checking whether
-latomic needs to be added to linker invocations as compiles() does not
perform the linking step and is therefore not appropriate for carrying
out this kind of checks.

See #5379

Merge branch '5379-use-links-for-checking-if-latomic-is-necessary' into 'main'

See merge request isc-projects/bind9!10592