- libpng is also needed on debian for iulib

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@36026 20353a03-c40f-0410-a6d1-a30d3c3de9de

buildout/helpers/debian.lenny.sh

@@ -14,6 +14,7 @@ libjpeg62-dev
 libldap2-dev
 libncurses5-dev
 libneon27-gnutls-dev
+libpng12-dev
 libreadline-dev
 libsasl2-dev
 libssl-dev