Test ls-s-works fails because GNU "ls -s" prints a "total" line,
while busybox "ls -s" does not. For example:

$ ./busybox ls -s applets_sh
     4 README       4 dos2unix       4 nologin      4 tac          4 unix2dos
$ ls -s applets_sh
total 20
4 dos2unix  4 nologin  4 README  4 tac  4 unix2dos

Busybox ls already has code for printing a total, however it is
only enabled in "ls -l", not "ls -s". This code is in function
scan_and_display_dirs_recur, where it calls calculate_blocks and
prints the result. It should be enabled when the LIST_BLOCKS
option (-s) is active also.