[4/5] WineD3D: SRGB write correction emulation

[Stefan Dösinger]

This patch adds emulation for srgb write correction using pixel shaders. This 
fixes the hl2 darkness "regression" after the srgb read correction 
implementation. There is a GLX extension for srgb writing, but since this 
extension also requires SRGB blending features(which d3d9 does not have), it 
is limited to geforce 8 cards only. For earlier cards we need something else.

The problem with the shader is that it adds a lot of extra code to the shader 
which would have dedicated silicon on the chip, and it does not work with the 
fixed function pipeline as long as we do not have an replacement shader for 
the fragment pipeline.
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