Fix socket_ce declaration

Author: nikic

ext/sockets/php_sockets.h

@@ -63,7 +63,7 @@ typedef struct {
 	zend_object std;
 } php_socket;
 
-zend_class_entry *socket_ce;
+extern zend_class_entry *socket_ce;
 
 static inline php_socket *socket_from_obj(zend_object *obj) {
 	return (php_socket *)((char *)(obj) - XtOffsetOf(php_socket, std));

ext/sockets/sockets.c

@@ -102,6 +102,7 @@ static PHP_RSHUTDOWN_FUNCTION(sockets);
 
 /* Socket class */
 
+zend_class_entry *socket_ce;
 static zend_object_handlers socket_object_handlers;
 
 static zend_object *socket_create_object(zend_class_entry *class_type) {