Add PHPAPI for session class entry

Author: dreamsxin

ext/session/php_session.h

@@ -311,16 +311,16 @@ PHPAPI ZEND_EXTERN_MODULE_GLOBALS(ps)
 void php_session_auto_start(void *data);
 
 #define PS_CLASS_NAME "SessionHandler"
-extern zend_class_entry *php_session_class_entry;
+extern PHPAPI zend_class_entry *php_session_class_entry;
 
 #define PS_IFACE_NAME "SessionHandlerInterface"
-extern zend_class_entry *php_session_iface_entry;
+extern PHPAPI zend_class_entry *php_session_iface_entry;
 
 #define PS_SID_IFACE_NAME "SessionIdInterface"
-extern zend_class_entry *php_session_id_iface_entry;
+extern PHPAPI zend_class_entry *php_session_id_iface_entry;
 
 #define PS_UPDATE_TIMESTAMP_IFACE_NAME "SessionUpdateTimestampHandlerInterface"
-extern zend_class_entry *php_session_update_timestamp_iface_entry;
+extern PHPAPI zend_class_entry *php_session_update_timestamp_iface_entry;
 
 extern PHP_METHOD(SessionHandler, open);
 extern PHP_METHOD(SessionHandler, close);