[Issue 23623] On 64 bit Windows the path should point to 64 bit dmd.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23623

--- Comment #1 from Bastiaan Veelo <Bastiaan at Veelo.net> ---
Since a number of tools that exist in "C:\D\dmd2\windows\bin" are absent in
"C:\D\dmd2\windows\bin64", it is probably best to include both in PATH, but
"bin64" before "bin".

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