Fix GH-16577: EG(strtod_state).freelist leaks with opcache.preload

This happens because on ZTS we execute `executor_globals_ctor` which reset the
`freelist` and `p5s` pointers, while on

Fix GH-16577: EG(strtod_state).freelist leaks with opcache.preload

This happens because on ZTS we execute `executor_globals_ctor` which reset the
`freelist` and `p5s` pointers, while on NTS we don't.
On NTS we can reuse the caches but on ZTS we can't, the easiest fix is
to call `zend_shutdown_strtod` when preloading is shut down.
This regressed in GH-13974 and therefore only exists in PHP 8.4 and
higher.

Closes GH-16602.

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