QUERY_TRACE: disable with -DNDEBUG

At least for now.  It didn't compile.

lib/layer/iterate.c

@@ -745,12 +745,12 @@ static int resolve(kr_layer_t *ctx, knot_pkt_t *pkt)
 	if (!query) {
 		return ctx->state;
 	}
-
+#ifndef NDEBUG
 	if (query->flags & QUERY_TRACE) {
 		VERBOSE_MSG("<= answer received:\n");
 		kr_pkt_print(pkt);
 	}
-
+#endif
 	if (query->flags & (QUERY_RESOLVED|QUERY_BADCOOKIE_AGAIN)) {
 		return ctx->state;
 	}

lib/rplan.h

@@ -51,7 +51,7 @@
 	X(BADCOOKIE_AGAIN, 1 << 22) /**< Query again because bad cookie returned. */ \
 	X(CNAME,           1 << 23) /**< Query response contains CNAME in answer section. */ \
 	X(REORDER_RR,      1 << 24) /**< Reorder cached RRs. */ \
-	X(TRACE,	   1 << 25) /**< Log answer with kr_verbose_log(). */
+	X(TRACE,	   1 << 25) /**< Log answer with kr_verbose_log(), unless -DNDEBUG. */
 			/* 1 << 31       Used by ../modules/dns64/dns64.lua */
 
 /** Query flags */