generalising IPV6_DONTFRAG to all bsd.

close #3704

(apply <#3716> to `main`)
(cherry picked from commit fe41e4a)

Author: devnexen

libc-test/semver/netbsd.txt

@@ -468,6 +468,7 @@ IPTOS_ECN_ECT0
 IPTOS_ECN_ECT1
 IPTOS_ECN_MASK
 IPTOS_ECN_NOTECT
+IPV6_DONTFRAG
 IPV6_JOIN_GROUP
 IPV6_LEAVE_GROUP
 IPV6_PKTINFO

libc-test/semver/openbsd.txt

@@ -311,6 +311,7 @@ IPTOS_ECN_ECT0
 IPTOS_ECN_ECT1
 IPTOS_ECN_MASK
 IPTOS_ECN_NOTECT
+IPV6_DONTFRAG
 IPV6_JOIN_GROUP
 IPV6_LEAVE_GROUP
 IPV6_PKTINFO

src/unix/bsd/apple/mod.rs

@@ -4147,7 +4147,6 @@ pub const IPV6_RECVHOPLIMIT: ::c_int = 37;
 pub const IPV6_PKTINFO: ::c_int = 46;
 pub const IPV6_HOPLIMIT: ::c_int = 47;
 pub const IPV6_RECVPKTINFO: ::c_int = 61;
-pub const IPV6_DONTFRAG: ::c_int = 62;
 pub const IP_ADD_SOURCE_MEMBERSHIP: ::c_int = 70;
 pub const IP_DROP_SOURCE_MEMBERSHIP: ::c_int = 71;
 pub const IP_BLOCK_SOURCE: ::c_int = 72;

src/unix/bsd/freebsdlike/mod.rs

@@ -973,7 +973,6 @@ pub const IPV6_PKTINFO: ::c_int = 46;
 pub const IPV6_HOPLIMIT: ::c_int = 47;
 pub const IPV6_RECVTCLASS: ::c_int = 57;
 pub const IPV6_TCLASS: ::c_int = 61;
-pub const IPV6_DONTFRAG: ::c_int = 62;
 pub const IP_ADD_SOURCE_MEMBERSHIP: ::c_int = 70;
 pub const IP_DROP_SOURCE_MEMBERSHIP: ::c_int = 71;
 pub const IP_BLOCK_SOURCE: ::c_int = 72;

src/unix/bsd/mod.rs

@@ -311,6 +311,7 @@ pub const IPV6_MULTICAST_IF: ::c_int = 9;
 pub const IPV6_MULTICAST_HOPS: ::c_int = 10;
 pub const IPV6_MULTICAST_LOOP: ::c_int = 11;
 pub const IPV6_V6ONLY: ::c_int = 27;
+pub const IPV6_DONTFRAG: ::c_int = 62;
 
 pub const IPTOS_ECN_NOTECT: u8 = 0x00;
 pub const IPTOS_ECN_MASK: u8 = 0x03;