Link with lber

setup.cfg overrides settings in setup.py. Include lber in list of
libraries in setup.cfg, too.

https://github.com/python-ldap/python-ldap/pull/173
Signed-off-by: Christian Heimes <cheimes@redhat.com>

setup.cfg

@@ -19,7 +19,7 @@ extra_objects =
 
 # Example for full-featured build:
 # Support for StartTLS/LDAPS, SASL bind and reentrant libldap_r.
-libs = ldap_r
+libs = ldap_r lber
 
 # Installation options
 [install]