[Issue 19051] Undefined functions Set/GetWindowLongPtr in mingw libs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19051

--- Comment #6 from Rainer Schuetze <r.sagitario at gmx.de> ---
The definitions of core.sys.windows don't go beyond Windows Vista, and I
suspect these are mostly covered by the current libraries.

If you want to go further, I recommend using the Windows SDK directly. Visual D
has a conversion tool to convert a bunch of headers to D:
https://github.com/dlang/visuald/blob/master/c2d/idl2d.d

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