Completely remove BIND 9 Windows support

The Windows support has been completely removed from the source tree and BIND 9 now no longer supports native compilation on Windows.

We might consider reviewing mingw-w64 port if contributed by external party, but no development efforts will be put into making BIND 9 compile and run on Windows again.

Closes #2690 (closed)

Edited by Ondřej Surý

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