util/ck_errf.pl: add detection of unknown libcrypto and libssl libs

The list of known libs are readily available in crypto/err/openssl.ec,
so lets use it to figure out if all error function codes belong to
known libs.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6455)