Log Message:
Update ruby-ldap to 0.9.12.

0.9.12
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* On windows, the default ldap library became wldap32;
* Fixed compile with ruby 1.9.2.

Thank to Hiroki Najima!

* Fixed many memory leaks;
* Added functions:
    LDAP::Conn.open_uri(uri);
    LDAP::explode_dn(dn, notypes);
    LDAP::explode_rdn(rdn, notypes).

Thanks to Marek Veber and Antonio Terceiro!

* Fixed bug in ldap/ldif.rb (GH-6).

Thanks to bbense.

* Fixed LDAP::Mod data corruption.

Thanks to Aprotim Sanyal!

* Enable client certificate authentication for mozilla ldap 6.0 only.

Thanks to Yuri Arabadji!