Remove an option related to a deprecated flag

CMS_NOOLDMIMETYPE and PKCS7_NOOLDMIMETYPE  are unused in pkcs7/cms code.

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1585)