Fix GH-17067: glob:// wrapper doesn't cater to CWD for ZTS builds

`glob(3)` doesn't know the virtual CWD of PHP, so we need to pass an
absolute path for ZTS builds. In lack of a reusabl

Fix GH-17067: glob:// wrapper doesn't cater to CWD for ZTS builds

`glob(3)` doesn't know the virtual CWD of PHP, so we need to pass an
absolute path for ZTS builds. In lack of a reusable routine, we copy
the code from `glob()` and adapt as needed.

Closes GH-17074.

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