winedos: Implement int10 CGA palette control.

[Peter Dons Tychsen]

Factor out the handling of the palette index and the "bright" bit,
so that int10 also can use these features. Int10 shares the possibility
to set these bits with VGA port 0x3d9.

This patch applies on top of my previous CGA patches, and causes even
more games to show the colors correctly.

Also fixes a single bad value in "CGA palette 2".

Thanks,

/pedro
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