Inherit hostflags verify params even without hosts

Inherit hostflags verify params even without hosts

X509_VERIFY_PARAM_inherit() now copies hostflags independently of hosts.

Previously hostflags were only copied when at least one host was set.
Typically applications don't configure hosts on SSL_CTX. The change
enables applications to configure hostflags on SSL_CTX and have OpenSSL
copy the flags from SSL_CTX to SSL.

Fixes: https://github.com/openssl/openssl/issues/14579
Signed-off-by: Christian Heimes <christian@python.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14743)