MSYS2: Native MinGW toolchain (upstreamed)

[Blackhex]

Description

Upstreaming efforts after #263 milestone will be reached.

Dependencies

• MSYS2: Native MinGW toolchain (recipes) #263

Acceptance Criteria

• Anyone from the community can download and use native ucrt-based MinGW toolchain MSYS2 packages from upstream MSYS2 packages repository in their MSYS2 shell.