Re: [PATCH 0/1] MR9474: winex11.drv: Set use_egl to false if it is unavailable.

[Tim Clem (＠tclem)]

Alternatively, visual_from_pixel_format could check `funcs->egl_handle`, but adjusting `use_egl` seemed cleaner (& preventative of future bugs).

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9474#note_122098