Fix provider compatibility check crash in evp_test

EVP_MAC_CTX_get_mac_size() cannot be called on older
unfixed versions before EVP_MAC_init().

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/23006)