[Issue 13265] Please detect the DXSDK when configuring sc.ini in the installer

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13265

--- Comment #6 from Orvid King <blah38621 at gmail.com> ---
Yes, environment variables do evaluate to an empty string if they aren't set.

Also, while I don't have a problem with adding the DirectX SDK, as it is common 
enough, I just want to ask the question, what are the requirements to getting a 
path added?

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