Link mode recreates existing hard links

[ZashIn]

Linker recreates existing hard links to same file, renaming old hard link to .rbackup.
On a clear, this results in a copy in overwrite, which show up as file conflicts, even though the file did not change.

This happens for e.g., when a second build is run after a first finished, without a clear in between.

Can be reproduced by running another program via onAboutToRun, like the precompilation for REDmods in Cyberpunk: ModOrganizer2/modorganizer-basic_games#105