sockets: add SO_INCOMING_CPU constant

get/set the cpu attached to a socket, no special treatment needed,
it is simply an integer.

Closes GH-7753.

Author: devnexen

UPGRADING

@@ -145,6 +145,9 @@ PHP 8.2 UPGRADE NOTES
 - COM_DOTNET:
   . LOCALE_NEUTRAL
 
+- Sockets:
+  . SO_INCOMING_CPU
+
 ========================================
 11. Changes to INI File Handling
 ========================================

ext/sockets/sockets.c

@@ -545,6 +545,9 @@ static PHP_MINIT_FUNCTION(sockets)
 #ifdef SO_MARK
 	REGISTER_LONG_CONSTANT("SO_MARK",   SO_MARK,    CONST_CS | CONST_PERSISTENT);
 #endif
+#ifdef SO_INCOMING_CPU
+	REGISTER_LONG_CONSTANT("SO_INCOMING_CPU",   SO_INCOMING_CPU,    CONST_CS | CONST_PERSISTENT);
+#endif
 #ifdef TCP_NODELAY
 	REGISTER_LONG_CONSTANT("TCP_NODELAY",   TCP_NODELAY,    CONST_CS | CONST_PERSISTENT);
 #endif