BUG: fix waf16 hook example to latest waf trunk.
BUG: fix waf16 hook example to latest waf trunk.

cournape/Bento,cournape/Bento,abadger/Bento,abadger/Bento,abadger/Bento,cournape/Bento,abadger/Bento,cournape/Bento