build.sh: remove obsolete libxkbui
build.sh: remove obsolete libxkbui

Last tarball shipped in May 2006.
No code change since.

Reviewed-by: Alan Coopersmith <ea3248f8c2440b9439894eab21ef26209b22bacf@sun.com>
Signed-off-by: Gaetan Nadon <8a8cc541338200f67d4d0bcb65c78b6166649462@videotron.ca>

freedesktop-unofficial-mirror/xorg__util__modular,tmzt/androix-util-modular,freedesktop-unofficial-mirror/xorg__util__modular,freedesktop-unofficial-mirror/xorg__util__modular,tmzt/androix-util-modular