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wgl: add MSAA support

Erik Faye-Lund requested to merge kusma/mesa:wgl-msaa into master

LLVMpipe recently got the ability to render to MSAA-surfaces, but in order for this to work on Windows, we need to allocate a separate MSAA resource and resolve using a blit before we can display it.

Without this, we end up always displaying the first sample instead of the resolved result.

This is also useful for the upcoming D3D12 driver.

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