MSYS2: /tmp paths resolve to C:/msys64/tmp/ in archives #9339
Description
in an MSYS2 environment, passing a POSIX-style path like /tmp as a source argument results in the path being expanded to its Windows equivalent (e.g., C:/msys64/tmp/...) before reaching Borg. This causes these absolute host-specific paths to be stored in the archive, which might be undesirable for cross-platform portability