KDC on Tru64 was hanging because of another case where Yarrow code

KDC on Tru64 was hanging because of another case where Yarrow code
assumes locks are recursive.  Probably didn't trigger on Linux,
Solaris, or NetBSD because they have /dev/random and Tru64 does not.

* yarrow.c (yarrow_input_maybe_locking): Renamed from
yarrow_input_maybe_locking, made static.  New argument indicates whether or not
to do locking.
(krb5int_yarrow_input): New wrapper function.
(yarrow_input_locked): New wrapper function.
(Yarrow_detect_fork): Call yarrow_input_locked.

ticket: 2755
status: open

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@16903 dc483132-0cff-0310-8789-dd5450dbe970