How about remove MINGW32/UCRT64/MINGW64 and introduce CLANG32 back.

[lygstate]

I think now ucrt are have much better Unicode support, we can drop the old
msvcrt.dll support, and for Windows 10 and upper always have ucrt
for Windows XP to 8 we can ship ucrt along with the application, so that's not a issue at all.

The default toolchain use llvm and fallback to gcc when needed.
There is not need create two set of that.

[lygstate]

UCRT64 may preserved for gcc libstdc++ if needed.

[taozuhong]

UCRT64 must be preserved. MINGW32/CLANG32 should keep be dropped.

[oold]

Would probably be best to drop MINGW32 to get rid of the last remaining legacy 32-bit environment. And drop MINGW64 since it uses the old weird msvcrt. All currently supported Windows versions have ucrt and I bet a lot of people are accidentally using MINGW64 packages instead of the UCRT64 ones because MinGW sounds more familiar to them.

[lazka]

We'll stop adding new mingw64 packages by default now. As a start..