opr: Define opr_mutex_t in lockstub.h
Like we do for opr_cv_t, define an opr_mutex_t to be a plain int, to
allow opr mutexes to be defined easily without ifdef guards.
Change-Id: Ib90017ac098ebc68ffd89890d448aabb2321f63e
Reviewed-on: https://gerrit.openafs.org/13886
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>