[php-src] Issue #8153: DateTime->sub produces different value than on older versions

Issue: https://github.com/php/php-src/issues/8153 Comment Author: cmb69 This is actually a timelib issue. Relevant code excerpt https://github.com/php/php-src/blob/33cd61c9045ae8675448456cdda6fb244b2efa01/ext/date/lib/interval.c#L326-L334 This can't work, since the changes after the first timelib_update_from_sse() are reset due to the second call to that function. I'm not sure whether that second call can be removed altogether, or whether it needs to be moved to the then-clause of the if-statement. @derickr certainly knows. :)