patch: ctor/dtor correction for target x86_64-pc-mingw32

[Kai Tietz]

Hi Dave,

> On 24 July 2007 13:19, Kai Tietz wrote:
> 
> > I tried to provide this change, but hadn't much success :(
> 
>   Got a link to any mailing list thread about that?
Sorry, I searched my e-mail archive, but I cleaned it up sometime ago. But 
I remember, that this discussion was around March-April this year on gcc 
list.

Cheers,
 i.A. Kai Tietz

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