- strip 399424 off the bss by making decompress_uncompress buffers config buffers.

- strip 399424 off the bss by making decompress_uncompress buffers config buffers.
  Compile tested (too lazy to look for a small .Z on the net).
$ size busybox.old busybox
   text    data     bss     dec     hex filename
 859555   10232  645732 1515519  171fff busybox.old
 859683   10232  246308 1116223  11083f busybox
$ make bloatcheck
function                                             old     new   delta
uncompress                                          1036    1160    +124
inbuf                                               2116       4   -2112
outbuf                                              4100       4   -4096
htab                                              131072       - -131072
codetab                                           262144       - -262144
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 1/2 up/down: 124/-399424)   Total: -399300 bytes