Add the new constants IP_RECVERR_RFC4884 and IPV6_RECVERR_RFC4884 from
Linux 5.9 to bits/in.h.
Tested for x86_64.
#define IP_CHECKSUM 23
#define IP_BIND_ADDRESS_NO_PORT 24
#define IP_RECVFRAGSIZE 25
+#define IP_RECVERR_RFC4884 26
/* IP_MTU_DISCOVER arguments. */
#define IP_PMTUDISC_DONT 0 /* Never send DF frames. */
#define IPV6_LEAVE_ANYCAST 28
#define IPV6_MULTICAST_ALL 29
#define IPV6_ROUTER_ALERT_ISOLATE 30
+#define IPV6_RECVERR_RFC4884 31
#define IPV6_IPSEC_POLICY 34
#define IPV6_XFRM_POLICY 35
#define IPV6_HDRINCL 36