Remove self/parent as known zend_strings

Author: Girgias

Zend/zend_string.h

@@ -621,8 +621,6 @@ EMPTY_SWITCH_DEFAULT_CASE()
 	_(ZEND_STR_NULL_LOWERCASE,         "null") \
 	_(ZEND_STR_MIXED,                  "mixed") \
 	_(ZEND_STR_TRAVERSABLE,            "Traversable") \
-	_(ZEND_STR_SELF,                   "self") \
-	_(ZEND_STR_PARENT,                 "parent") \
 	_(ZEND_STR_SLEEP,                  "__sleep") \
 	_(ZEND_STR_WAKEUP,                 "__wakeup") \
 	_(ZEND_STR_CASES,                  "cases") \