js-of-ocaml release 6.3.2-3 for unstable

[dgit distro=debian split --quilt=gbp]
[dgit please-upload source=js-of-ocaml version=6.3.2-3 upstream-tag=upstream/6.3.2 upstream=9369d459767c2dba3c4da92950da8461b6898c53]