Allow LDAP_PVT_SASL_LOCAL_SSF to be set externally

include/ldap_pvt.h

@@ -179,7 +179,9 @@ LDAP_F (int) ldap_pvt_sasl_install LDAP_P(( struct sockbuf *, void * ));
 LDAP_F (void) ldap_pvt_sasl_remove LDAP_P(( struct sockbuf * ));
 #endif /* HAVE_CYRUS_SASL */
 
+#ifndef LDAP_PVT_SASL_LOCAL_SSF
 #define LDAP_PVT_SASL_LOCAL_SSF	71	/* SSF for Unix Domain Sockets */
+#endif
 
 struct ldap;
 struct ldapmsg;