winedos/int10 clearscreen fix

[Ulrik Mikaelsson]

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> Since you are on CVS I assume that this is a regression. could you
> please find the patch that broke it.
As i said, I have also tested the program on my laptop, which have not been 
touched since yesterday, when it worked (no cvs update or recompile since 
then). Very, very strange.

Regards Ulrik
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