feat: IP_RECVTTL for FreeBSD/DragonFlyBSD

Author: SteveLauC

libc-test/semver/dragonfly.txt

@@ -501,6 +501,7 @@ IPV6_DONTFRAG
 IP_HDRINCL
 IP_RECVDSTADDR
 IP_RECVIF
+IP_RECVTTL
 IP_SENDSRCADDR
 IP_TOS
 ITIMER_PROF

libc-test/semver/freebsd.txt

@@ -576,6 +576,7 @@ IP_RECVIF
 IP_RECVORIGDSTADDR
 IP_DONTFRAG
 IP_RECVTOS
+IP_RECVTTL
 IP_RSS_LISTEN_BUCKET
 IP_SENDSRCADDR
 IP_TOS

src/unix/bsd/freebsdlike/mod.rs

@@ -970,6 +970,7 @@ pub const IP_SENDSRCADDR: ::c_int = IP_RECVDSTADDR;
 pub const IP_ADD_MEMBERSHIP: ::c_int = 12;
 pub const IP_DROP_MEMBERSHIP: ::c_int = 13;
 pub const IP_RECVIF: ::c_int = 20;
+pub const IP_RECVTTL: ::c_int = 65;
 pub const IPV6_JOIN_GROUP: ::c_int = 12;
 pub const IPV6_LEAVE_GROUP: ::c_int = 13;
 pub const IPV6_CHECKSUM: ::c_int = 26;