add static check for supported complier versions directly in the code

[mw66]

https://forum.dlang.org/post/ikppzbtqzgiydcaokikn@forum.dlang.org

The compilers turned out to be problematic though. The "Mir" library does not work with the Ubuntu 18.04 gdc and ldc compilers. I have managed to install the latest version dmd, and it works.

The latest version of Mir can only be compiled with latest Ldc 1.30, 1.29 doesn't work.

Maybe Mir should add static check for supported complier versions, rather than let user try and error.

Not everyone use dub to build.