Adding bunch of FreeBSD socket options flags specifics.

SO_USER_COOKIE primarly to be traced via dtrace instrumentation.
If SO_USER_COOKIE is available, the rest is so the former is
two years old while the rest is from around 2008.

Author: devnexen

UPGRADING

@@ -256,6 +256,14 @@ PHP 7.4 UPGRADE NOTES
   . MB_ONIGURUMA_VERSION specifies the version of the oniguruma library against
     which mbregex has been built.
 
+- Socket:
+  . Added FreeBSD-specific socket options:
+  . SO_LABEL
+  . SO_PEERLABEL
+  . SO_LISTENQLIMIT
+  . SO_LISTENQLEN
+  . SO_USER_COOKIE
+
 - Tidy:
   . TIDY_TAG_ARTICLE
   . TIDY_TAG_ASIDE

ext/sockets/sockets.c

@@ -781,6 +781,13 @@ static PHP_MINIT_FUNCTION(sockets)
 	REGISTER_LONG_CONSTANT("SO_ERROR",		SO_ERROR,		CONST_CS | CONST_PERSISTENT);
 #ifdef SO_BINDTODEVICE
 	REGISTER_LONG_CONSTANT("SO_BINDTODEVICE",       SO_BINDTODEVICE,        CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SO_USER_COOKIE
+	REGISTER_LONG_CONSTANT("SO_LABEL",       SO_LABEL,        CONST_CS | CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("SO_PEERLABEL",       SO_PEERLABEL,        CONST_CS | CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("SO_LISTENQLIMIT",       SO_LISTENQLIMIT,        CONST_CS | CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("SO_LISTENQLEN",       SO_LISTENQLEN,        CONST_CS | CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("SO_USER_COOKIE",       SO_USER_COOKIE,        CONST_CS | CONST_PERSISTENT);
 #endif
 	REGISTER_LONG_CONSTANT("SOL_SOCKET",	SOL_SOCKET,		CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("SOMAXCONN",		SOMAXCONN,		CONST_CS | CONST_PERSISTENT);