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Do not use header_prev in expire_lru_headers

Ondřej Surý requested to merge 4595-fix-expire-lru-headers-race into main

dns__cacherbt_expireheader can unlink / free header_prev underneath it. Use ISC_LIST_TAIL after calling dns__cacherbt_expireheader instead to get the next pointer to be processed.

Closes #4595 (closed)

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