Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

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.

show more ...