dropbear: disable zlib support when built with small option

Closes #3733

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
diff --git a/CHANGES b/CHANGES
index 3678d23..a60a898 100644
--- a/CHANGES
+++ b/CHANGES
@@ -23,6 +23,7 @@
 	#3541: Quotes in the top Makefile:217 break buildroot/kernel config...
 	#3571: u-boot: fw_printenv does not build
 	#3643: popt source url is not responding
+	#3733: dropbear: make zlib optional
 
 2011.02, Released February 28th, 2011: