Move the inclusion of openldap-server/options.mk to *before* krb5.bl3.mk.
Otherwise, with non-native kerberos, bdb.buildlink3.mk is included by
heimdal's bl3.mk before BDB_ACCEPTED is set, we get the wrong answer out,
and the package fails to build.

It's a good thing heimdal doesn't also need to set BDB_ACCEPTED I guess...

(dholland)