Merge pull request ocaml#12038 from rlepigre/master

New release of imagelib (version 20180522)

packages/imagelib/imagelib.20180522/descr

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+The imagelib library implements image formats such as PNG and PPM
+
+The imagelib library implements image formats such as PNG and PPM in
+OCaml, relying on only one external dependency: 'decompress'.
+
+Supported image formats:
+ - PNG (full implementation of RFC 2083),
+ - PPM, PGM, PBM, ... (fully supported),
+ - JPG (only image size natively, conversion to PNG otherwise),
+ - GIF (only image size natively, conversion to PNG otherwise),
+ - XCF (only image size natively, conversion to PNG otherwise),
+ - Other formats rely on 'convert' (imagemagick).
+
+As imagelib only requires 'decompress', it can be used together with
+js_of_ocaml to compile projects to Javascript. Note that some of the
+features of imagelib require the convert binary  (and thus cannot be
+used from Javascript).

packages/imagelib/imagelib.20180522/opam

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+opam-version: "1.2"
+available:  [ ocaml-version >= "4.03.0" ]
+maintainer: "Rodolphe Lepigre <[email protected]>"
+authors: "Rodolphe Lepigre <[email protected]>"
+homepage: "http://lepigre.fr"
+bug-reports: "Rodolphe Lepigre <[email protected]>"
+license: "LGPL-3.0"
+dev-repo: "git://github.com:rlepigre/ocaml-imagelib.git"
+build: [make]
+install: [make "install"]
+remove: [make "uninstall"]
+depends: [
+  "ocamlfind" {build}
+  "ocamlbuild" {build}
+  "decompress" {>= "0.7"}
+]
+post-messages: [
+  "imagelib requires convert (imagemagick) to handle format other than png and ppm."
+]

packages/imagelib/imagelib.20180522/url

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+archive: "https://github.com/rlepigre/ocaml-imagelib/archive/ocaml-imagelib_20180522.tar.gz"
+checksum: "d5cf13df81f189c1f7cddaebfe524d73"