Replace index_in_[sub]str_array with index_in_[sub]strings,

which scans thru "abc\0def\0123\0\0" type strings. Saves 250 bytes.

   text    data     bss     dec     hex filename
 781266    1328   11844  794438   c1f46 busybox_old
 781010    1328   11844  794182   c1e46 busybox_unstripped

console-tools/setconsole.c

@@ -13,7 +13,7 @@
 #if ENABLE_FEATURE_SETCONSOLE_LONG_OPTIONS
 static const char setconsole_longopts[] =
 	"reset\0" No_argument "r"
-	"\0";
+	;
 #endif
 
 #define OPT_SETCONS_RESET 1