Fix #80863: ZipArchive::extractTo() ignores references

We need to cater to references, when traversing the files to extract.
While we're at it, we move the `zval_file` declaration into a

Fix #80863: ZipArchive::extractTo() ignores references

We need to cater to references, when traversing the files to extract.
While we're at it, we move the `zval_file` declaration into a narrower
scope.

Closes GH-6959.

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