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iris: Handle vertex shader with window space position

Iris advertises support for PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION so let's actually implement it.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110657

This would fix DX9 games running via gallium9 which use D3DFVF_XYZRHW

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