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Building with `/W3` shows an awful lot of warnings on Windows, so it's really hard to spot the more important ones. Since it is not possible to override the hard-coded `/W3`, we drop it altogether, so MSVC uses the default `/W1`. Users are encouraged to increase the warning level via the environment variable `CFLAGS` before doing configure. We also enable `/WX` (treat warnings as errors) for AppVeyor CI, using `/W1` for now, since otherwise the build would fail.