Replaces clock_gettime() with ast_tsnow()

clock_gettime() is, unfortunately, not portable. But I did like that
over our usual `ts.tv_nsec = tv.tv_usec * 1000` copy/paste code we
usually do when we want a timespec and all we have is ast_tvnow().

This patch adds ast_tsnow(), which mimics ast_tvnow(), but returns a
timespec. If clock_gettime() is available, it will use that. Otherwise
ast_tsnow() falls back to using ast_tvnow().

Change-Id: Ibb1ee67ccf4826b9b76d5a5eb62e90b29b6c456e

tests/test_dns_query_set.c

@@ -245,7 +245,7 @@ static enum ast_test_result_state query_set_test(struct ast_test *test, int reso
 		}
 	}
 
-	clock_gettime(CLOCK_REALTIME, &timeout);
+	timeout = ast_tsnow();
 	timeout.tv_sec += 10;
 
 	ast_mutex_lock(&qsdata->lock);