[travis] [build] Disable warnings for sexplib >= 0.13, fix Coq version

This should fix Travis on newer sexplib, and still keep compat with
0.12.

We also fix Coq's Travis install [wrong version picked for this branch]

.travis.yml

@@ -31,9 +31,9 @@ env:
   - COMPILER="4.07.1"
   # Main test suites
   matrix:
-  - TEST_TARGET="build"   COMPILER="4.07.1"       EXTRA_OPAM="coq"
-  - TEST_TARGET="test"    COMPILER="4.07.1"       EXTRA_OPAM="coq coq-mathcomp-ssreflect"
-  - TEST_TARGET="js-dune" COMPILER="4.07.1+32bit" EXTRA_OPAM="coq js_of_ocaml js_of_ocaml-lwt"
+  - TEST_TARGET="build"   COMPILER="4.07.1"       EXTRA_OPAM="coq.8.10.2"
+  - TEST_TARGET="test"    COMPILER="4.07.1"       EXTRA_OPAM="coq.8.10.2 coq-mathcomp-ssreflect"
+  - TEST_TARGET="js-dune" COMPILER="4.07.1+32bit" EXTRA_OPAM="coq.8.10.2 js_of_ocaml js_of_ocaml-lwt"
   # Don't test opam in 8.10 [yet]
   - TEST_TARGET="test"    SERAPI_COQ_HOME="$HOME/coq-$COQ_VERSION/_build/install/default/lib/"
 

serapi/serapi_protocol.ml

@@ -385,7 +385,7 @@ type query_opt =
     pp    : format_opt [@default { pp_format = PpSer; pp_depth = 0; pp_elide = "..."; pp_margin = 72 } ];
     (* Legacy/Deprecated *)
     route : Feedback.route_id [@default 0];
-  }
+  } [@@ocaml.warning "-3"]
 
 (** XXX: This should be in sync with the object tag!  *)
 type query_cmd =
@@ -656,14 +656,14 @@ let coq_protect e =
     (* Richpp.richpp_of_pp msg *)
 
 type parse_opt =
-  { ontop  : Stateid.t sexp_option }
+  { ontop  : Stateid.t sexp_option } [@@ocaml.warning "-3"]
 
 type add_opts = {
   lim    : int       sexp_option;
   ontop  : Stateid.t sexp_option;
   newtip : Stateid.t sexp_option;
   verb   : bool      [@default false];
-}
+} [@@ocaml.warning "-3"]
 
 module ControlUtil = struct
 
@@ -773,7 +773,7 @@ type newdoc_opts =
   ; iload_path   : Mltop.coq_path list sexp_option
   (* Libs to require in STM init *)
   ; require_libs : (string * string option * bool option) list sexp_option
-  }
+  } [@@ocaml.warning "-3"]
 
 (******************************************************************************)
 (* Help                                                                       *)

serapi/serapi_protocol.mli

@@ -300,7 +300,7 @@ type query_opt =
     (** Printing format of the query, this can be used to select the type of the answer, as for example to show goals in human-form. *)
     route : Feedback.route_id [@default 0];
     (** Legacy/Deprecated STM query method *)
-  }
+  } [@@ocaml.warning "-3"]
 
 (** Query commands are mostly a tag and some arguments determining the result type.
 
@@ -365,8 +365,7 @@ end
 type parse_opt =
   { ontop  : Stateid.t sexp_option
   (** parse [ontop] of the given sentence *)
-  }
-
+  } [@@ocaml.warning "-3"]
 
 (** [Add] will take a string and parse all the sentences on it, until an error of the end is found.
     Options for [Add] are: *)
@@ -379,7 +378,7 @@ type add_opts = {
   (** Make [newtip] the new sentence id, very useful to avoid synchronous operations *)
   verb   : bool      [@default false];
   (** [verb] internal Coq parameter, be verbose on parsing *)
-}
+} [@@ocaml.warning "-3"]
 
 (******************************************************************************)
 (* Init / new document                                                        *)
@@ -395,7 +394,7 @@ type newdoc_opts =
   (** Initial LoadPath for the document *) (* [XXX: Use the coq_pkg record?] *)
   ; require_libs : (string * string option * bool option) list sexp_option
   (** Libraries to load in the initial document state *)
-  }
+  } [@@ocaml.warning "-3"]
 
 (******************************************************************************)
 (* Help                                                                       *)

sertop/sertop_ser.ml

@@ -185,6 +185,7 @@ type query_opt =
      Sexplib.Conv.sexp_option := sexp_option;
   ]]
   [@@deriving sexp]
+  [@@ocaml.warning "-3"]
 
 type query_cmd =
   [%import: Serapi_protocol.query_cmd]
@@ -257,6 +258,7 @@ type add_opts =
      Sexplib.Conv.sexp_option := sexp_option;
   ]]
   [@@deriving sexp]
+  [@@ocaml.warning "-3"]
 
 type newdoc_opts =
   [%import: Serapi_protocol.newdoc_opts
@@ -266,13 +268,15 @@ type newdoc_opts =
      Sexplib.Conv.sexp_option := sexp_option;
   ]]
   [@@deriving sexp]
+  [@@ocaml.warning "-3"]
 
 type parse_opt =
   [%import: Serapi_protocol.parse_opt
   [@with
      Sexplib.Conv.sexp_option := sexp_option;
   ]]
   [@@deriving sexp]
+  [@@ocaml.warning "-3"]
 
 type cmd =
   [%import: Serapi_protocol.cmd]