1/2 XRender: add a helper function for color conversion [resubmit]

[Roderick Colenbrander]

Hi,

This is a resubmit of my previous patch which adds a helper function
for color conversion. The previous version was broken like hell
(apparently I tested a previous winex11.drv build or so..). This
version works well.

Regards,
Roderick Colenbrander
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