RFC: Fix intel libxess on intel GPUs

[Etaash-mathamsetty]

this is not a completely finished PR, a mechanism needs to be found to load igdext64 on the initialization of dxgi. (probably in dxvk). This is more of a question on whether something like this will be accepted into proton.

What I currently know:

• this disables the xess fallback entirely
• force_vendor_id = -1 is no longer required on intel
• first patch is probably fine as-is

What I do not know:

• number of games this could break