liblbxutil: remove obsolete library

This is the client-side library for the LBX extension, which was removed
from xserver 1.2 (released 2007).

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-core/packagegroups/packagegroup-meta-oe.bb

@@ -595,7 +595,6 @@ RDEPENDS:packagegroup-meta-oe-graphics ="\
     font-cursor-misc \
     font-misc-misc \
     xorg-fonts-100dpi \
-    liblbxutil \
     libxaw6 \
     libxkbui \
     libxpresent \