3/3 winex11: use get_xrender_picture in X11DRV_XRender_GetSrcAreaStretch

[Roderick Colenbrander]

Hi,

Use get_xrender_picture in X11DRV_XRender_GetSrcAreaStretch. The patch
has been tested with several test apps including Office2007 and
appears to work fine. In some tests the performance can double (that
was at least on a crappy software xrender, on a hardware xrender
implementation the gain might be even bigger).

Regards,
Roderick Colenbrander
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