xcb_util.inc: Remove packaging and modify SRC_URI for multiple ${BPN} names

xcb_util.inc: Remove packaging and modify SRC_URI for multiple ${BPN} names

Xcb-util was split into separate packages during the 0.3.6 -> 0.3.8 transition.
Update xcb_util.inc to reflect that by removing the older packaging.
Libxcbatom, libxcbaux and libxcbevent are merged into libxcbutil.
Libxcbicccm, libxcbimage, libxcbkeysyms and libxcbwm are now separate packages.
Libxcbproperty and libxcbreply were made obsolete with this commit:

http://cgit.freedesktop.org/xcb/util/commit/?id=81c62e7a04213abefa1ea82819887aaaa3c31a74

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>