[FR] Detect if an appropriate version of MSVC is already configured

[namazso]

What's the problem this feature will solve?

I was attempting to compile with the Microsoft EWDK, but received error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/ while running from the developer prompt. I was quite puzzled by the nonsensical error, as the active developer prompt was, in fact, "Microsoft Visual C++ 14.0 or greater".

Describe the solution you'd like

Detect the already configured compiler, and if it is suitable just use it, without the user having to find out about the existence of DISTUTILS_USE_SDK.

Alternative Solutions

If the envvars look to be configured while printing the earlier error, inform the user about the existence of DISTUTILS_USE_SDK that lets them just use the configured compiler, so that they don't have to go deep in setuptools source code to find out about it.

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