DH: have DH_set_length() increment the dirty count.
DH: have DH_set_length() increment the dirty count.

The recommended private key length is a key parameter among other key
parameters, and is included in the key data transferred in an import
or export between legacy implementations and provider implementations.

Reviewed-by: Paul Dale <bc4a6b4cd7a8395c734c8eb5aef04a9c30188c85@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/13166)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl