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xwayland: add wlr_xwayland_surface_has_window_type()

John Lindgren requested to merge jlindgren90/wlroots:has-window-type into master

The infrastructure to read _NET_WM_WINDOW_TYPE already exists in wlroots (it's used for example in wlr_xwayland_or_surface_wants_focus()). But the window type isn't easily accessible to the compositor because the atoms to compare against are private to xwm.c.

labwc has recently gone to a fair amount of effort (including opening a whole new xcb connection) just to get the needed window type atoms:

It seems much cleaner to add the remaining few (3) atoms to wlroots and implement a shared function which can be used by any wlroots compositor.

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