winex11: Fix Office2007 XRender regression [resubmit]

[Roderick Colenbrander]

Hi,

This is a resubmit of the previous fix. No changes have been made to
the patch itself. Alexandre preferred to store source coordinates by
default in a transformation matrix but this proved to be very slow on
most XRender implementations (software xrender can easily be 20-30x
faster while inte/nvidia drivers take a 2x hit). A bug report has been
submitted to Xorg as this issue can be fixed inside X without changes
to drivers.

Regards,
Roderick Colenbrander
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