Modify EVP_CIPHER_is_a() and EVP_MD_is_a() to handle legacy methods too

Modify EVP_CIPHER_is_a() and EVP_MD_is_a() to handle legacy methods too

These functions would only handle provided methods, but there are
cases where the caller just passes along a received method without
knowing the underlying method tech, so might pass along a legacy
method.  We therefore need to have them handle this case as well so
they don't cause any unnecessary surprises.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10845)