ocaml 4 warning fix

git-svn-id: http://haxe.googlecode.com/svn/trunk@6666 f16182fa-f095-11de-8f43-4547254af6c6
[all] forgot to update install.ml
as usual


git-svn-id: http://haxe.googlecode.com/svn/trunk@6667 f16182fa-f095-11de-8f43-4547254af6c6