Remove unused class

Author: joehoyle

src/types/class_object.rs

@@ -14,8 +14,8 @@ use crate::{
     convert::{FromZendObject, FromZendObjectMut, FromZval, FromZvalMut, IntoZval},
     error::{Error, Result},
     ffi::{
-        _zend_class_entry, ext_php_rs_zend_object_alloc, ext_php_rs_zend_object_release,
-        object_properties_init, zend_object, zend_object_std_init, zend_objects_clone_members,
+        ext_php_rs_zend_object_alloc, ext_php_rs_zend_object_release, object_properties_init,
+        zend_object, zend_object_std_init, zend_objects_clone_members,
     },
     flags::DataType,
     types::{ZendObject, Zval},