fsck_msdos(8) on macOS

The text e164d2b9ebb8, as Mac OS X 10.1.5, Mac OS X 10.1.4, Mac OS X 10.1.3, Mac OS X 10.1.2, Mac OS X 10.1.1, Mac OS X 10.1 shipped it.

DOS/Windows (FAT) filesystem consistency checker

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