The current mingw32 and mingw64 cross-toolchains provided by Fedora
target the MSVCRT (Microsoft Visual C++ Runtime). Since Visual Studio
15 & Windows 10, the default and recommended runtime is UCRT. See also
[
https://www.msys2.org/docs/environments/#msvcrt-vs-ucrt MSVCRT vs
UCRT].
A new toolchain target triple `x86_64-w64-mingw32ucrt` and associated
binaries will be added.
Fedora MinGW macros will be provided to target UCRT, with ucrt64-*
prefix (ex: `ucrt64-meson`)
mingw-* libraries will be progressively adjusted to add the produced
ucrt64-* binaries.