ARC bomb on zero-length files + fix

[Howard Chu]

Go ahead and install this fix, it's simple enough and the problem does
arise often enough to need it. Keep your original distribution handy,
though, because a lot of diffs are on the way. (Including these fixes.)
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  /
 /_ , ,_.                      Howard Chu
/ /(_/(__                University of Michigan
    /           Computing Center          College of LS&A
   '              Unix Project          Information Systems