winex11: use bilinear filtering in xrender

[Roderick Colenbrander]

Hi,

By default XRender uses nearest neighbor filtering which results in
ugly scaling. See for instance
http://bugs.winehq.org/show_bug.cgi?id=20732. Selecting bilinear
filtering improves image quality a lot.

Current image quality:
http://bugs2.winehq.org/attachment.cgi?id=24785

Image quality with bilinear filtering:
http://roderick.student.utwente.nl/sample.png

Later on we should likely also don't use xrender for mono->mono
stretching which would improve it a bit more:
http://roderick.student.utwente.nl/sample2.png

Regards,
Roderick Colenbrander
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