[package] base-files: use "zonename" system option to symlink /etc/localtime via /tmp/localtime to /usr/share/zoneinfo for glibc and eglibc


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@28306 3c298f89-4303-0410-b956-a3cf2f4a3e73