[Issue 20456] New: linker can't find the C function wmemove when -mscrtlib=msvcrt

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20456

          Issue ID: 20456
           Summary: linker can't find the C function wmemove when
                    -mscrtlib=msvcrt
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: sahmi.soulaimane at gmail.com

The following program fails to link.
```
import core.stdc.wchar_;
int main()
{
    wchar_t[10] a = void;
    wchar_t[10] b = void;
    wmemmove(a.ptr, b.ptr, 10);

    return 0;
}
```

compiled with: dmd test.d -m64 -mscrtlib=msvcrt

The equivalent C program succeds.
```
#include <wchar.h>

int main()
{
    wchar_t a[10];
    wchar_t b[10];
    wmemmove(a,b,10);

    return 0;
}
```

compiled with: cl test.c /MD

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