anvil: Fix initialization when `bind_wl_display` fails.
anvil: Fix initialization when `bind_wl_display` fails.

If the `egl`-feature is enabled, but `bind_wl_display` fails (e.g. when
software rendering via llvmpipe is in use), we should not fail to start.

Smithay/smithay,Smithay/smithay,vberger/smithay,Smithay/smithay,Smithay/smithay,vberger/smithay