Fix ff tools error, compatible with -Wstringop-overflow with different gcc versions.

Author: jfb8856606

tools/libnetgraph/msg.c

@@ -217,10 +217,14 @@ NgDeliverMsg(int cs, const char *path,
 	/* Prepare socket address */
 	sg->sg_family = AF_NETGRAPH;
 	/* XXX handle overflow */
+#if __GNUC__ >= 13
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wstringop-overflow"
+#endif
 	strncpy(sg->sg_data, path, NG_PATHSIZ);
+#if __GNUC__ >= 13
 #pragma GCC diagnostic pop
+#endif
 	sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
 
 	/* Debugging */

tools/ngctl/write.c

@@ -108,10 +108,14 @@ WriteCmd(int ac, char **av)
 	/* Send data */
 	sag->sg_len = 3 + strlen(hook);
 	sag->sg_family = AF_NETGRAPH;
+#if __GNUC__ >= 13
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wstringop-overflow"
+#endif
 	strlcpy(sag->sg_data, hook, sizeof(sagbuf) - 2);
+#if __GNUC__ >= 13
 #pragma GCC diagnostic pop
+#endif
 	if (sendto(dsock, buf, len,
 	    0, (struct sockaddr *)sag, sag->sg_len) == -1) {
 		warn("writing to hook \"%s\"", hook);