`zip_file` prelude rule partially exported

[benbrittain]

The prelude rule for zip_file looks like it's been partially exported.

It looks like the toolchain target that is used internal to Meta is called fbsource//xplat/buck2/platform/zip_file:zip_file. I'm pretty sure the rule can't be used without it, the arguments don't refer to a zip tool I'm aware of. I'd guess it's a python wrapper around the zip tool itself.