04c5a9f053
On X11 windowing systems there's no `MessageBox` prompt like on win32 that could show users that they have unsupported GPUs, this leads to confusion to them as they typically don't open blender from a command line so none of the messages could be available. This patch utilizes `system->showMessageBox` to display a GUI message box telling the user that the GPU is unsupported. Pull Request: https://projects.blender.org/blender/blender/pulls/126220