[Windows] Please support the MinGW-w64 compiler

[arakov]

Discussed in https://github.com/orgs/ELENA-LANG/discussions/754

^{Originally posted by chadchoi April 27, 2025}
I tried to compile Elena from source with this command: make clean_amd64 all_amd64. It ran for a while and failed with errors about mkdir. Based on the error messages, I think it's thinking that it's compiling for Linux and thus failed to compile because it's using non-existing functions on Windows.

p/s: I'm using MSYS2, with UCRT64 prompt.

[arakov]

Support was added