Remove obsolete variable

src/include/build.sh

     local version=$(get_version)
     local dirname=$MKIT_PKGNAME-$version
     mkdir -p "$dirname"
-    local item
     cp -R "$(ini values "lists:dist")" "$dirname"
     sed -i -e "s/^VERSION = .*/VERSION = $version/" "$dirname/config.mk"
     tar -cf "$dirname.tar" "$dirname"