Ticket 48537 - undefined reference to `abstraction_increment'

Bug Description:  Nunc-stan's has a component, liblfds. This was failing with
gcc 6.0.

Fix Description:  Fix a macro check for correctly detecting gcc 6 or higher in
liblfds. Increase the DS version of nunc-stans to 0.1.8 to consume the fix.

https://fedorahosted.org/389/ticket/48537

Author: wibrown

Review by: nhosoi (Thanks!)

rpm/389-ds-base.spec.in

@@ -15,7 +15,7 @@
 # To build without nunc-stans, set use_nunc_stans to 0.
 %global use_nunc_stans __NUNC_STANS_ON__
 %if 0%{?use_nunc_stans:1}
-%global nunc_stans_ver 0.1.7
+%global nunc_stans_ver 0.1.8
 %endif
 
 # Are we bundling jemalloc?