ospfd: remove unused code

The code for nssa_range and other bits that were written but
never used.
diff --git a/ospfd/ospfd.c b/ospfd/ospfd.c
index 0188ffd..e840513 100644
--- a/ospfd/ospfd.c
+++ b/ospfd/ospfd.c
@@ -1204,6 +1204,7 @@
   return 1;
 }
 
+#if 0
 /* XXX: unused? Leave for symmetry? */
 static int
 ospf_area_nssa_translator_role_unset (struct ospf *ospf,
@@ -1221,6 +1222,7 @@
 
   return 1;
 }
+#endif
 
 int
 ospf_area_export_list_set (struct ospf *ospf,