[Issue 5562] Add OS=win32wine build to druntime's posix.mak

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=5562

Mathias LANG <pro.mathias.lang at gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |pro.mathias.lang at gmail.com
         Resolution|---                         |WONTFIX

--- Comment #3 from Mathias LANG <pro.mathias.lang at gmail.com> ---
We can now use `build.d` to build under wine as opposed to the Makefile.
See discussion here for a use case:
https://github.com/dlang/dmd/pull/10731#issuecomment-575538851

Closing as WONTFIX since the functionality is here but not in the way the issue
requests it.

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