dpkg: reduce bss usage by ~130 kbytes (yes, kilobytes!)

at the cost of ~100 bytes of text.
Improves friendliness to nommu systems.
(Dunno whether nommu people ever use dpkg, though...)

scripts/objsizes

@@ -4,4 +4,4 @@ printf "%9s %11s %9s %9s %s\n" "text+data" text+rodata rwdata bss filename
 find -name '*.o' | sed 's:^\./::' | xargs size | grep '^ *[0-9]' \
 | while read text data bss dec hex filename; do
     printf "%9d %11d %9d %9d %s\n" $((text+data)) $text $data $bss "$filename"
-done
+done | sort -r