Feat(Apple): Add the LOCAL_PEERTOKEN socket option (#3929)

* Feat(apple): Add LOCAL_PEERTOKEN

Taken from `sys/un.h`.

Signed-off-by: Paul Mabileau <paul.mabileau@harfanglab.fr>

* Docs(apple): Add description for LOCAL_PEER* socket options

Signed-off-by: Paul Mabileau <paul.mabileau@harfanglab.fr>

* Chore(test/apple): Add the LOCAL_PEERTOKEN symbol

Signed-off-by: Paul Mabileau <paul.mabileau@harfanglab.fr>

---------

Signed-off-by: Paul Mabileau <paul.mabileau@harfanglab.fr>

(backport <#3929>)
(cherry picked from commit 0a25ed8)

Author: PaulDance

libc-test/semver/apple.txt

@@ -849,6 +849,7 @@ LOCAL_PEEREPID
 LOCAL_PEEREUUID
 LOCAL_PEERPID
 LOCAL_PEERUUID
+LOCAL_PEERTOKEN
 LOGIN_PROCESS
 LOG_AUTHPRIV
 LOG_CRON

src/unix/bsd/apple/mod.rs

@@ -4194,11 +4194,18 @@ pub const TCP_CONNECTION_INFO: ::c_int = 0x106;
 
 pub const SOL_LOCAL: ::c_int = 0;
 
+/// Retrieve peer credentials.
 pub const LOCAL_PEERCRED: ::c_int = 0x001;
+/// Retrieve peer PID.
 pub const LOCAL_PEERPID: ::c_int = 0x002;
+/// Retrieve effective peer PID.
 pub const LOCAL_PEEREPID: ::c_int = 0x003;
+/// Retrieve peer UUID.
 pub const LOCAL_PEERUUID: ::c_int = 0x004;
+/// Retrieve effective peer UUID.
 pub const LOCAL_PEEREUUID: ::c_int = 0x005;
+/// Retrieve peer audit token.
+pub const LOCAL_PEERTOKEN: ::c_int = 0x006;
 
 pub const SOL_SOCKET: ::c_int = 0xffff;