Add dev-ml/msgpck

Signed-off-by: Shin'ya Minazuki <shinyoukai@laidback.moe>

dev-ml/msgpck/Manifest

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+DIST msgpck-1.7.tbz 9860 BLAKE2B b74f957f8c671c6015508b442f51d341a390d8aca6c564a114e33235150d9cb4d8baafc45724dff986416eb55949a5a2ba62bd4c71c4ad672279b3cce8f662f1 SHA512 7d71baa9614f890f669bb52181a295e51d6735ab9786fd7bc69c123721f801232a314ec98b8e59ccf8d2c1541f8fcc084ebf1d47189fd45632621c4a246d0368

dev-ml/msgpck/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>shinyoukai@laidback.moe</email>
+		<name>Shin'ya Minazuki</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">vbmithr/ocaml-msgpck</remote-id>
+		<bugs-to>https://github.com/vbmithr/ocaml-msgpck</bugs-to>
+	</upstream>
+</pkgmetadata>

dev-ml/msgpck/msgpck-1.7.ebuild

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+# Copyright 2026 Shin'ya Minazuki
+
+EAPI=8
+
+inherit dune
+
+DESCRIPTION="Fast MessagePack library"
+HOMEPAGE="https://opam.ocaml.org/packages/msgpck https://github.com/vbmithr/ocaml-msgpck"
+SRC_URI="https://github.com/vbmithr/ocaml-msgpck/releases/download/${PV}/msgpck-v${PV}.tbz -> ${P}.tbz"
+
+S="${WORKDIR}/${PN}-v${PV}"
+
+LICENSE="ISC"
+SLOT="0"
+KEYWORDS="~amd64"
+
+DEPEND="dev-ml/ocplib-endian"
+BDEPEND="${DEPEND}"
+RDEPEND="${DEPEND}"
+
+IUSE="ocamlopt"