NDA_PROBES not defined yet, so work around.

(Logical change 1.155)
diff --git a/ip/ipneigh.c b/ip/ipneigh.c
index 882d8c3..e8ab291 100644
--- a/ip/ipneigh.c
+++ b/ip/ipneigh.c
@@ -287,10 +287,12 @@
 		       ci->ndm_confirmed/hz, ci->ndm_updated/hz);
 	}
 
+#ifdef NDA_PROBES
 	if (tb[NDA_PROBES] && show_stats) {
 		__u32 p = *(__u32 *) RTA_DATA(tb[NDA_PROBES]);
 		fprintf(fp, " probes %u", p);
 	}
+#endif
 
 	if (r->ndm_state) {
 		int nud = r->ndm_state;