[PATCH] Replace libx11 by libxcb

[Havoc Pennington]

Given that libX11 now uses xcb as backend, I don't understand the
value of porting to use libxcb directly when there isn't an issue of
round trips or other stuff. It will just make #ifdef hell, while the
X11 API is an API that works on both xcb and non-xcb platforms.

Maybe people should be thinking about porting xcb to non-Linux
platforms? The X protocol should be the same on other UNiX, so xcb in
theory ought to work fine if you just compiled it on Solaris/BSD, same
as GTK or dbus or Qt would work fine.

Havoc