To build busybox for TS-75XX/TS-4500 series, you must use for best
compatibility:

	make EXTRA_LDFLAGS="-Wl,--rpath,/slib -Wl,-dynamic-linker,/slib/ld-uClibc.so.0"

When finished building, copy busybox binary to /bin/ on the initrd
partition, replacing what was there before.  For any busybox programs like
'chat', simply create a symlink:

	ln -s /bin/busybox /bin/chat
