There is finally some movement around the maximum PDU size of RTR in IETF.
It seems that RTR will get a maximum PDU size of 65535 so adjust our code.
Also IBUF_READ_SIZE no longer matters since the ibuf API now handles
larger PDUs just fine.

-- 
:wq Claudio

Index: rtr_proto.c
===================================================================
RCS file: /cvs/src/usr.sbin/bgpd/rtr_proto.c,v
diff -u -p -r1.47 rtr_proto.c
--- rtr_proto.c	26 Nov 2024 13:59:54 -0000	1.47
+++ rtr_proto.c	9 Jan 2025 09:34:22 -0000
@@ -42,7 +42,7 @@ struct rtr_header {
 	uint32_t	length;
 } __packed;
 
-#define RTR_MAX_PDU_SIZE	49152	/* XXX < IBUF_READ_SIZE */
+#define RTR_MAX_PDU_SIZE	65535
 #define RTR_MAX_PDU_ERROR_SIZE	256
 #define RTR_DEFAULT_REFRESH	3600
 #define RTR_DEFAULT_RETRY	600