[ocamlnet] Segfault with ocaml 4.02

Hi,

I'm playing with ocaml 4.02 these days and I encountered a segfault 
while using Netexn.to_string_opt line 35 (not directly but that what the 
callstack says).
That's maybe due to the fact that the representation of exceptions has 
changed (see also: https://github.com/ocsigen/js_of_ocaml/pull/109)

Cheers,

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