Fix external symbols related to provider related security checks for

Fix external symbols related to provider related security checks for
keys and digests.

Partial fix for #12964

This adds ossl_ names for the following symbols:

digest_get_approved_nid, digest_get_approved_nid_with_sha1
digest_is_allowed, digest_md_to_nid, digest_rsa_sign_get_md_nid,
securitycheck_enabled,
dh_check_key, dsa_check_key, ec_check_key,

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14211)