Zend: give zend_type_kind enum a tag name

Co-authored-by: Tim Düsterhus <timwolla@googlemail.com>

Author: azjezz

Zend/zend_types.h

@@ -115,7 +115,7 @@ typedef void (*copy_ctor_func_t)(zval *pElement);
 
 /* zend_type.kind discriminates what type.ptr points at. Exactly one value
  * applies at a time; it is a plain enum, not a bitmask like type_mask. */
-typedef enum {
+typedef enum zend_type_kind {
 	ZEND_TYPE_KIND_NONE         = 0, /* no payload; ptr is NULL */
 	ZEND_TYPE_KIND_NAME         = 1, /* a `zend_string*` (class name) */
 	ZEND_TYPE_KIND_LITERAL_NAME = 2, /* a `const char*` (literal class name) */