dnsmasq: bind each address once, at start, after it exists (hq issue 348)
bind-dynamic closes every listener whose interface a re-read of the machine's addresses did not find, and a re-read during a bridge teardown fails (dnsmasq 2.93 network.c:832-875, reproduced in a network namespace: 53 releases in 120 parallel teardowns). bind-interfaces never closes a listener; a drop-in makes the unit wait for the private address and retry a start that found it missing.
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