wglgears: mark application as dpi-aware

Erik Faye-Lund requested to merge kusma/mesa-demos:win32-highdpi into master

This makes rendering nice and crisp on high-dpi systems. Since we're not doing any layouting or anything, we can just claim to be aware without doing much.

We keep the current window-size when the DPI changes, because the size is specified in pixels, so it seems more useful to keep that as-is.

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