Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/tar-x-vs-non-empty-links/readme

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I just ran into this reading an old 4bsd tar archive:
if the size on the tape of a link is non-zero, tar x and tar t
will get confused about position on the tape and typically
blow up with a checksum error.  (unix tar evidently had the same bug;
I tried a late research unix tar and it blew up the same way.)

The fix is one line; I added some comments and a little paranoia
against similar future problems.

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