stat: code shrink; stop using bss; stop using strncat incorrectly

function                                             old     new   delta
printfs                                                -      28     +28
strcatc                                                -      26     +26
human_time                                            41      44      +3
print_it                                             229     219     -10
buf                                                   30       -     -30
print_statfs                                         420     358     -62
print_stat                                          1089     921    -168
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 1/3 up/down: 57/-270)          Total: -213 bytes
   text    data     bss     dec     hex filename
 771105    1029    9552  781686   bed76 busybox_old
 770892    1029    9520  781441   bec81 busybox_unstripped

1 file changed