Log Message:
openssl: on NetBSD arches without atomic 64-bit ops, use builtin fallbacks.

Fixes these errors on NetBSD/macppc (and presumably the other listed platforms):

ld: ./libcrypto.so: undefined reference to `__atomic_load_8'
ld: ./libcrypto.so: undefined reference to `__atomic_fetch_or_8'
ld: ./libcrypto.so: undefined reference to `__atomic_is_lock_free'

(suggested by riastradh@)