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wglgears: set whole process as dpi-aware

Erik Faye-Lund requested to merge kusma/mesa-demos:wglgears-nvidia-dpi-aware-fix into master

It seems different GPU drivers behave differently in the case of per-thread DPI-awareness, causing incorrect rendering on drivers like the NVIDIA-driver. This is probably related to some internal threading in the drivers, and is probably a subtle driver-bug.

In either case, setting per-process DPI awareness seems to do the trick. It doesn't matter to us if we're doing per process or per thread, so let's just go with the more robust solution.

Fixes: 7fa3a433 ("wglgears: mark application as dpi-aware")

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