make ZLIB_DEFLATE visible, so that we can choose whether we want it built-in
or as a module
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -92,7 +92,7 @@ config ZLIB_INFLATE
tristate
config ZLIB_DEFLATE
- tristate
+ tristate "Zlib compression"
config LZO_COMPRESS
