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src: use `unordered_set` instead of custom rb tree

Rodrigo Muino Tomonari requested to merge github/fork/addaleax/cares-no-rb into master

Use a standard hash-based container instead of the custom included red/black tree implementation. There is likely no noticeable performance difference, and if there is one, it is very likely to be an improvement.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

src/cares_wrap

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