Make Samba compile on RH 6.2 again.

Make Samba compile on RH 6.2 again.

We now include the libber.h file if required, but currently we just don't use
ldap.  (I'll chase this up).

In the meantime, I've moved the ads_status code about, its now in its own file,
and has a couple of #ifdefs to allow smbd to link - becouse the lack of LDAP
caused HAVE_ADS to be undefined. (I hope its not too ugly).

Andrew Bartlett
(This used to be commit 14407c87e2dcccae1784290e3eb7a2d611516aff)