support for Tru64 Unix 5.1

[Doryce E . Moore]

I tried to build a generic popper for Tru64 Unix 5.1.  The password 
that works for a clear-text telnet login will not work for popper.  I 
tried it with enable-special-auth and without it.  I am using 
qpopper4.0.3.  The configure and make complete without errors.
-- 
Doryce E. Moore, Center for Computational Science
System Support Group
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