Add previews of some of the platform packages with OCaml 4.13 compati…

…bility

packages/odoc/odoc.2.0.0~4.13preview/opam

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+opam-version: "2.0"
+
+homepage: "http://github.com/ocaml/odoc"
+doc: "https://ocaml.github.io/odoc/"
+bug-reports: "https://github.com/ocaml/odoc/issues"
+license: "ISC"
+
+authors: [
+  "Thomas Refis <[email protected]>"
+  "David Sheets <[email protected]>"
+  "Leo White <[email protected]>"
+  "Anton Bachin <[email protected]>"
+  "Jon Ludlam <[email protected]>"
+]
+maintainer: "Anton Bachin <[email protected]>"
+dev-repo: "git+https://github.com/ocaml/odoc.git"
+
+synopsis: "OCaml documentation generator"
+description: """
+Odoc is a documentation generator for OCaml. It reads doc comments,
+delimited with `(** ... *)`, and outputs HTML. 
+"""
+
+depends: [
+  "astring"
+  "cmdliner"
+  "cppo" {build}
+  "dune" {>= "2.7"}
+  "fpath"
+  "ocaml" {>= "4.13" & < "4.14"}
+  "result"
+  "tyxml" {>= "4.3.0"}
+  "fmt"
+  "logs"
+  "re" {>= "1.7.2"}
+
+  "alcotest" {dev & >= "0.8.3"}
+  "markup" {dev & >= "1.0.0"}
+  "ocamlfind" {dev}
+  "sexplib" {dev & >= "113.33.00"}
+
+  "bisect_ppx" {dev & >= "1.3.0"}
+]
+
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+url {
+  git: "git://github.com/kit-ty-kate/odoc.git#413"
+}

packages/ppxlib/ppxlib.0.23.0~4.13preview/opam

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+opam-version: "2.0"
+synopsis: "Standard library for ppx rewriters"
+description: """
+Ppxlib is the standard library for ppx rewriters and other programs
+that manipulate the in-memory reprensation of OCaml programs, a.k.a
+the "Parsetree".
+
+It also comes bundled with two ppx rewriters that are commonly used to
+write tools that manipulate and/or generate Parsetree values;
+`ppxlib.metaquot` which allows to construct Parsetree values using the
+OCaml syntax directly and `ppxlib.traverse` which provides various
+ways of automatically traversing values of a given type, in particular
+allowing to inject a complex structured value into generated code.
+"""
+maintainer: ["Jane Street developers"]
+authors: ["Jane Street Group, LLC"]
+license: "MIT"
+homepage: "https://github.com/ocaml-ppx/ppxlib"
+doc: "https://ocaml-ppx.github.io/ppxlib/"
+bug-reports: "https://github.com/ocaml-ppx/ppxlib/issues"
+depends: [
+  "dune" {>= "2.7"}
+  "ocaml" {>= "4.13" & < "4.14"}
+  "ocaml-compiler-libs" {>= "v0.11.0"}
+  "ppx_derivers" {>= "1.0"}
+  "sexplib0" {>= "v0.12"}
+  "stdlib-shims"
+  "ocamlfind" {with-test}
+  "re" {with-test & >= "1.9.0"}
+  "cinaps" {with-test & >= "v0.12.1"}
+  "base" {with-test}
+  "stdio" {with-test}
+  "odoc" {with-doc}
+]
+conflicts: [
+  "jbuilder" # https://github.com/ocaml-ppx/ppxlib/issues/251
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/ocaml-ppx/ppxlib.git"
+url {
+  git: "git://github.com/kit-ty-kate/ppxlib.git#413"
+}

packages/utop/utop.2.8.0~4.13preview/opam

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+opam-version: "2.0"
+maintainer: "[email protected]"
+authors: "Jérémie Dimino"
+license: "BSD3"
+homepage: "https://github.com/ocaml-community/utop"
+bug-reports: "https://github.com/ocaml-community/utop/issues"
+doc: "https://ocaml-community.github.io/utop/"
+depends: [
+  "ocaml" {>= "4.13" & < "4.14"}
+  "base-unix"
+  "base-threads"
+  "ocamlfind" {>= "1.7.2"}
+  "lambda-term" {>= "3.1.0" & < "4.0"}
+  "lwt"
+  "lwt_react"
+  "camomile"
+  "react" {>= "1.0.0"}
+  "cppo" {build & >= "1.1.2"}
+  "dune" {>= "1.0"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+  ["dune" "runtest" "-p" name "-j" jobs] {with-test}
+]
+dev-repo: "git+https://github.com/ocaml-community/utop.git"
+synopsis: "Universal toplevel for OCaml"
+description: """
+utop is an improved toplevel (i.e., Read-Eval-Print Loop or REPL) for
+OCaml.  It can run in a terminal or in Emacs. It supports line
+edition, history, real-time and context sensitive completion, colors,
+and more.  It integrates with the Tuareg mode in Emacs.
+"""
+url {
+  git: "git://github.com/ocaml-community/utop.git#master"
+}