[2/2] WineD3D: Re-download dirty GL surfaces

[Phil Costin]

This patch enables the forced re-downloading of dirty GL surfaces.

It requires [1/2] WineD3D: Mark GL Surface Clean after Fresh Surface
Download and is the first step toward supporting gamma-corrected (sRGB)
texture sampling support.

Thanks to Stefan Dösinger for his advice in IRC during the implementation of
these 2 patches.
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