Bug in "/usr/lib/sendmail" in SUN UNIX release 2.0.

[Stephen J. Muir]

If you are running the above mentioned system then do *not* use the "-bz" flag
of "/usr/lib/sendmail" and ensure that the file "/usr/lib/sendmail.fc" doesn't
exist.  Otherwise, the wrong bits of "/usr/lib/sendmail" may be overwritten on
execution causing strange behaviour.
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