restore compatibility with gallium's camlp4 (broken by commit 8e07227c)

 Apparently, in camlp4 (unlike camlp5) :

 - Something like "[ kwd = IDENT "foobar" -> .... kwd ... ]"
   produces a kwd of type token instead of string (which sounds reasonable ?).
   For now, I've replaced kwd by the explicit strings. Not so nice, but works
   with both camlp4 and camlp5

 - A quotation of the form "let obj = ... in bar; baz" is not
   interpreted in the usual OCaml way, but rather as
   "(let obj = ... in bar); baz".
   Let's use instead "let obj = ... in let () = bar in baz", which works fine.

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