Combined with commit 0ffc59d341, this
fixes the case where there are duplicate files on the special remote,
and the first gets modified/deleted, while the second is still present.
directory, adb: Fixed a bug when importtree=yes, and multiple files in the
special remote have the same content, that caused it to refuse to get a
file from the special remote, incorrectly complaining that it had changed,
due to only accepting the inode+mtime of one file (that was since modified
or deleted) and not accepting the inode+mtime of other duplicate files.
Sponsored-by: Max Thoursie on Patreon