nslookup: smaller qtypes[] array

nslookup: smaller qtypes[] array

function                                             old     new   delta
nslookup_main                                       2708    2715      +7
qtypes                                                80      72      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 7/-8)               Total: -1 bytes
   text	   data	    bss	    dec	    hex	filename
 926277	    555	   5740	 932572	  e3adc	busybox_old
 926262	    555	   5740	 932557	  e3acd	busybox_unstripped

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