unwind: wildcard in blacklist

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Soon, unwind will have support wildcard in blacklist.

Here, a change that makes any domain in the blacklist that starts with ‘.’, which is not a legal name due to an empty label, is treated as any subdomain on that zone.

This means that .example.com blocks all requests to any subdomain of example.com, but allows example.com.

Changes: https://marc.info/?l=openbsd-cvs&m=173244784522937&w=2

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