[Dcmlib] gdcmlib with mingw

[Mathieu Malaterre]

> i had some, in cmake config files, there shoud be changes about exporting 
> symbols depending on WIN32, but this was in version 0.6, i have personalized 
> (with needed changes source for crosscompilation i used few times.

Michal,

I'd love to see this patch ! Could you please send it to me or the mailing. This would be a great addition to the toolkit to be supported on mingw32.

thanks
Mathieu