[Issue 24195] New: DMD defaults Winver to Windows XP

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24195

          Issue ID: 24195
           Summary: DMD defaults Winver to Windows XP
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: grimmaple95 at gmail.com

Provided no other stuff is fed to the compiler, it will default the
`_WIN32_WINNT` constant to `0x501`, which is Windows XP. This leaves a lot of
modern features out, so it should probably be updated to something reasonably
modern (eg Windows 8, as Windows 7 is old enough to be officially not
supported)

Also, there is no reasonbale hint to why stuff is missing, and the windows
versions are not (or poorly) documented.

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