prebuild-install will mutate the contents of an hard-linked `.node` file

[segevfiner]

If there is already a .node file, and it is an hard-link, prebuild-install will mutate the contents of the hard-linked file instead of replacing it with a new file.

This can happen for example from pnpm's side effect cache, when pnpm uses hard links, which happens for example on Linux with an ext4 file system.

This caused node files to get changed in other unrelated working trees on our computers when running prebuild-install to switch the .node files to different versions for other operating systems or architectures.