Fix the Z_IMMUTABLE macro - '(' was mismatched

The macro properly has two matching `(` and `)` symbols
after this change.

This typo was causing syntax errors when compiling extensions
using the (deprecated) macro.

This fixes a bug in the PHP 7.3 branch introduced by
742d5a0

Author: TysonAndre

Zend/zend_types.h

@@ -591,8 +591,8 @@ static zend_always_inline uint32_t zval_gc_info(uint32_t gc_type_info) {
 #define Z_COPYABLE(zval)			((Z_TYPE(zval) == IS_ARRAY)
 #define Z_COPYABLE_P(zval_p)		Z_COPYABLE(*(zval_p))
 
-/* deprecated: (IMMUTABLE is the same as IS_ARRAY && !REFCOUED) */
-#define Z_IMMUTABLE(zval)			((Z_TYPE_INFO(zval) == IS_ARRAY)
+/* deprecated: (IMMUTABLE is the same as IS_ARRAY && !REFCOUNTED) */
+#define Z_IMMUTABLE(zval)			(Z_TYPE_INFO(zval) == IS_ARRAY)
 #define Z_IMMUTABLE_P(zval_p)		Z_IMMUTABLE(*(zval_p))
 #define Z_OPT_IMMUTABLE(zval)		Z_IMMUTABLE(zval_p)
 #define Z_OPT_IMMUTABLE_P(zval_p)	Z_IMMUTABLE(*(zval_p))