ntp: Undo upstream (ntp.org) fix for upstream Bug 3851

The patch for upstream (ntp.org) fix for upstream Bug 3851 may have
fixed a Linux bug but it caused a regression when ntpd is run on
FreeBSD.

Suggested that so@ publish an errata and merge this to releng/14.2.

PR:		283116
MFH:		3 days

contrib/ntp/ntpd/ntp_proto.c

@@ -471,6 +471,7 @@ transmit(
 		return;
 	}
 
+#if 0
 	/* [Bug 3851] drop pool servers which can no longer be reached. */
 	if (MDF_PCLNT & peer->cast_flags) {
 		if (   (IS_IPV6(&peer->srcadr) && !nonlocal_v6_addr_up)
@@ -479,6 +480,7 @@ transmit(
 			return;
 		}
 	}
+#endif
 
 	 /*
 	 * In unicast modes the dance is much more intricate. It is