[Backport] Windows: Restrict path for dynamic library loading

[jibeee]

This PR prevents DLL planting on Windows.

libusb loads USB backends from various path using LoadLibrary. This
function performs a search through various path when provided a library
name that does not include a path element. An attacker could plant a DLL
in one of the searched path, and it would be loaded by libusb.

To prevent this, libraries are now only loaded from the Windows system
directory.

Based on libusb@c3deb6d

[kevinmehall]

This outdated fork of libusb has many problems, and backporting changes one-by-one seems futile.

cc @thegecko -- I can move this fork to the node-usb org if you want it.

[thegecko]

I can move this fork to the node-usb org if you want it.

I think that makes sense. Happy to then update the submodule

[kevinmehall]

Transferred the repo

[jibeee]

Do you need more information for the review?

[thegecko]

Do you need more information for the review?

@kevinmehall is better placed to review this PR. We need to decide whether to either apply patches like this or re-implement hotplug support on top of the latest libusb.

Alternatively, if everyone could focus on fixing libusb#86, we could just use upstream libusb :)