[Issue 5093] improve error for importing std.c.windows.windows

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=5093

Dmitry Olshansky <dmitry.olsh at gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |dmitry.olsh at gmail.com
         Resolution|---                         |WORKSFORME

--- Comment #6 from Dmitry Olshansky <dmitry.olsh at gmail.com> ---
This program compiles fine on Ubuntu right now:

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import std.c.windows.windows;

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Was fixed years ago when we introduced top-level version per platform in each
file.

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