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Add missing acquire memory barrier in isc_nmhandle_unref

Ondřej Surý requested to merge 1474-threadsanitizer-data-race-lib-dns-message-c into master

The ThreadSanitizer uses system synchronization primitives to check for data race. The netmgr handle->references was missing acquire memory barrier before resetting and reusing the memory occupied by isc_nmhandle_t.

Closes #1474 (closed)

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