Be smarter about failure to read backup file contents

Instead of always printing MISSING, we can switch on the errno value set by
access() and print a more useful string. In this case, handle files we can't
read by printing UNREADABLE, print MISSING on ENOENT, and print UNKNOWN for
anything else. Fixes FS#22546.

Signed-off-by: Dan McGee <dan@archlinux.org>

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