libfido2: specify OpenSSL 1.1 API

OPENSSL_API_COMPAT can be used to specify the OpenSSL API version in
use for the purpose of hiding deprecated interfaces and enabling
the appropriate deprecation notices.

This change is a NFC while we're still using OpenSSL 1.1.1 but will
avoid deprecation warnings upon the switch to OpenSSL 3.0. A future
libfido2 update may switch to use OpenSSL 3.0 APIs.

Sponsored by: The FreeBSD Foundation