[PATCH wayland] add apis to enable/disable wayland debug at runtime

[박성진]

Hello,
I added two apis in wayland-util to enable/disable display of wayland debug
information at runtime.

I had a difficulty to see wayland debug information at runtime when I'd
like to debug both a compositor and client(s).
And I found that there is no proper apis yet to enable/disable wayland
debug information at runtime.

Actually, we already know that we can see wayland debug information by
setting WAYLAND_DEBUG environment to 1.
But the environment will merely check when a compositor creates a wayland
display or a client tries to connect to an wayland display.
IMO, it's better to have the additional apis to enable/disable wayland
debug information at runtime.
It would also help if we are to catch the problems associated with timing.

Plz kindly review this patch.

Thanks,
Sung-Jin Park
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