backport r902654 from trunk:

mod_authnz_ldap: If AuthLDAPCharsetConfig is set, also convert the password to
UTF-8.

PR: 45318
Adapted patch from Johannes Mueller


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1005537 13f79535-47bb-0310-9956-ffa450edef68