Log Message:
Update to libxcb-1.1.

Depend on xcb-proto 1.1 at least.

Changes from
http://lists.freedesktop.org/archives/xcb/2007-November/003041.html

Enhancements:
* Print a backtrace, if possible, on locking assertion failures.
* Skip abort() on locking assertions if LIBXCB_ALLOW_SLOPPY_LOCK is set.
* xcb_poll_for_event: Return already-read events before reading again.
* Output a configuration summary at the end of ./configure.

Bug fixes:
* Don't hold the xlib-xcb lock while sleeping: that allows deadlock.
* Allow unix:<screen> style display names again.
* Bug #9119: test xcb_popcount
* Fix unit tests for FreeBSD
* NetBSD doesn't have AI_ADDRCONFIG: use it only if it's available.
* Require libXau >= 0.99.2; earlier versions have a broken .pc file
* Use substitition variables in xcb-xinerama.pc.in
* Update autogen.sh to one that does objdir != srcdir
* Add tools/* and autogen.sh to EXTRA_DIST.
* Doxygen can now be fully disabled if desired.

Documentation improvements:
* Many fixes and updates to the tutorial.
* Iterators, requests, and replies get partial Doxygen documentation.