Fix oss-fuzz #71382 (#15854)

The return value of zho_build_properties_ex() is passed to ZVAL_ARR(), which sets the IS_TYPE_REFCOUNTED flag. Returning &zend_emtpy_array will crash later when

Fix oss-fuzz #71382 (#15854)

The return value of zho_build_properties_ex() is passed to ZVAL_ARR(), which sets the IS_TYPE_REFCOUNTED flag. Returning &zend_emtpy_array will crash later when trying to dtor the zval.

I'm fixing this by returning zend_new_array(0) instead of &zend_empty_array.

An alternative was to make ZVAL_ARR() aware of immutable arrays, like ZVAL_STR() is with interned strings, but I found no other problematic cases.

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