[Bug 57584] 8-bit color mode is broken in Wine 9.11 and later

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57584

--- Comment #3 from Rémi Bernon  ---
I thought we were emulating 8bit display mode already, but maybe only for GDI
rendering and we're then missing it on the GL/VK side.

As we're likely going to move towards more virtualization of the GL/VK
rendering (for DPI scaling, compositing, etc) this use case would be addressed
that way, and I'm not sure it's worth supporting such exotic host display
server configuration.

Anyway, it was working before, I'll have a look.