[Issue 17384] LDC x64 linker error in VS2017

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17384

--- Comment #3 from kinke at gmx.net ---
> Visual D doesn't use LDC's automatic detection because it doesn't allow
> using different versions of VS.

It is possible - via env variable `LDC_VSDIR`. For LDC 1.0.0 compatibility,
it'd have to end with a backslash, e.g., `LDC_VSDIR=C:\Program Files
(x86)\Microsoft Visual Studio 12.0\`.

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