wayland: Drop unused input-inhibitor protocol
Otherwise phog will fail to start with upcoming phoc 0.44.0.
I hope we get phrog into place til then but it might sense to fix it anyway.
It's unused and wlroots 0.18.x dropped support for it.
This is phosh commit 4d4adb5ebe6cbe597846940974cf7a1bd6df5678
Signed-off-by: Guido Günther agx@sigxcpu.org