busybox

wget,ftpd: shorten and reuse strings

function                                             old     new   delta
wget_main                                           2382    2386      +4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 4/0)                 Total: 4 bytes
   text	   data	    bss	    dec	    hex	filename
 934228	    477	   7296	 942001	  e5fb1	busybox_old
 934202	    477	   7296	 941975	  e5f97	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>