[Xcb] What happened to libxcb-xlib?

[David Ronis]

I'm in the process of building the trunk xorg.  I've noticed that
libxcb-xlib no longer seems to be built, and perhaps worse, the one I
have on my system has missing symbols, specifically
_xcb_lock/unlock_io_.

This has broken many applications here.  Any suggestions?   I can
reinstall the old versions, but I'd rather not if possible.  

Recompiling the broken applications is a 
also not an easy option.