Umlauts support

[Darius Spitznagel <d.spitznagel [at] goodbytez.de>]

    Hello devs,
      
      nslcd is really usefull and easy to setup, thank you.
      BUT nslcd does not like umlauts:(
      
      snippet from syslog...
      ...
      Aug  9 21:34:48 rkt22 nslcd[28681]: [90700b] <group(all)>
      CN=Domänen-Admins,CN=Users,DC=rkt-zentral,DC=local:
      sAMAccountName: denied by validnames option
      Aug  9 21:34:48 rkt22 nslcd[28681]: [90700b] <group(all)>
      CN=Domänen-Benutzer,CN=Users,DC=rkt-zentral,DC=local:
      sAMAccountName: denied by validnames option
      Aug  9 21:34:48 rkt22 nslcd[28681]: [90700b] <group(all)>
      CN=Domänen-Gäste,CN=Users,DC=rkt-zentral,DC=local: sAMAccountName:
      denied by validnames option
      ,,,
      
      Could you please fix that for german users?
      Would like to test a patch if needed. 
      
      Kind regards,
      Darius