[Issue 18953] Win32: extern(C++) struct destructor not called correctly through runtime

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18953

--- Comment #1 from Rainer Schuetze <r.sagitario at gmx.de> ---
Probalby happens because TypeInfo_Struct.destroy doesn't use the expected
__thiscall calling convention:
https://github.com/dlang/druntime/blob/master/src/object.d#L2010

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