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[9.18] Add missing node lock when setting node->wild in rbtdb.c

Mark Andrews requested to merge 3799-tsan-race-between-dns_rbtnode_t-bitfields-v9_18 into v9_18

Backport of MR !7392 (merged)

The write node lock needs to be held when setting node->wild in add_wildcard_magic except when being called from loading_addrdataset which is used to load the zone without locking during its initial load.

(cherry picked from commit 81c24b8d)

Closes #3799 (closed)

Edited by Mark Andrews

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