Merge hurtonm@3678c32, seems to be solving the race condition/assert in #1015
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Revert "Merge hurtonm@3678c32, seems to be solving the race condition/assert in #1015"

This reverts commit 0483f7bbe2ddb160b6bf5f4dcaf069ac45dcdb30.
Backported jemc/libzmq@5cf74db (Failing test reproducing issue #1015)
inproc_lat builds