CI: Don't run windows-meson-mingw-ucrt64 by default
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CI: Don't run windows-meson-mingw-ucrt64 by default
Workaround for #462: if this doesn't run reliably as a result of external factors, then we shouldn't be using it as a CI gate.
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CI: Enable "debian mingw64 meson debug" by default
This gives us coverage for Meson mingw-w64 by default, but cross-compiling from Debian with MSVCRT rather than a native compilation on Windows with UCRT. When combined with "windows msys64 ucrt64 cmake", this fills in most of the missing coverage caused by disabling windows-meson-mingw-ucrt64 to work around #462.