missing libc-lock.h in 1998-1012

[tprince@cat.e-mail.com]

libio build fails with "No rule to make target 'libc-lock.h' needed
by  'filedoalloc.o'.   Same problem on irix6.4, hpux10.20, and
cygwin32.
Dr. Timothy C. Prince
Consulting Engineer
Solar Turbines, a Caterpillar Company
alternate e-mail: tprince@computer.org

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