egl/wayland: ignore unsupported driver configs
What does this MR do and why?
Prevents a segfault in
if (!server_supports_format(&dri2_dpy->formats, idx)) {
if (dri2_dpy->fd_render_gpu == dri2_dpy->fd_display_gpu)
continue;
if (!server_supports_pipe_format(&dri2_dpy->formats,
dri2_wl_visuals[idx].alt_pipe_format)) {
^^^^^^^^^^^^^^^^^^^^