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Remove lockmgr_waiters(9) and BUF_LOCKWAITERS(9); they were not used

Description

Remove lockmgr_waiters(9) and BUF_LOCKWAITERS(9); they were not used
for anything.

Reviewed by: kib@
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D7420

Details