OzonePlaformWayland: Adapt to https://codereview.chromium.org/1025293002
OzonePlaformWayland: Adapt to https://codereview.chromium.org/1025293002

DriGpuPlatformSupportHost's constructor now takes requires a non-NULL
DriCursor. The easiest way for us to adapt is to create a DriCursor (and
consequently a DriWindowManager as well) and pass it to
DriGpuPlatformSupportHost even if we don't use it for anything.

Fixes #370.

joone/ozone-wayland,nagineni/ozone-wayland,kuscsik/ozone-wayland,nagineni/ozone-wayland,kuscsik/ozone-wayland,joone/ozone-wayland,clopez/ozone-wayland,likewise/ozone-wayland,siteshwar/ozone-wayland,kishansheshagiri/ozone-wayland,kishansheshagiri/ozone-wayland,joone/ozone-wayland,siteshwar/ozone-wayland,siteshwar/ozone-wayland,01org/ozone-wayland,kishansheshagiri/ozone-wayland,nagineni/ozone-wayland,clopez/ozone-wayland,01org/ozone-wayland,joone/ozone-wayland,siteshwar/ozone-wayland,kishansheshagiri/ozone-wayland,likewise/ozone-wayland,clopez/ozone-wayland,likewise/ozone-wayland,likewise/ozone-wayland,kuscsik/ozone-wayland,nagineni/ozone-wayland,01org/ozone-wayland,kuscsik/ozone-wayland,01org/ozone-wayland,clopez/ozone-wayland