dev-java/gradle-bin: add 6.3-rc-3 for JDK 15 usage

dev-java/gradle-bin/Manifest

+DIST gradle-bin-6.3_rc3.zip 145307780 BLAKE2B c0f25573fdaccda8044fe1f1bcc660ae62b0f455c2fb7f91109a9bfa9be4e3092393981c1f25ebdb73c9f3ea767c9d38a9ea9d19152bd1813984116d077597c4 SHA512 83511d8e6698806aab2b074c3f8c1e4f28340428757ddce3bb01c41eebbebda756e96944f0e3f56b3b8e39effb16c2850ca5255b1e5e66089aa9317bf2a8221c
+EBUILD gradle-bin-6.3_rc3.ebuild 1057 BLAKE2B e7e482c5b979b2d57425661d03d6e317448d57040dc435685ef3db4b88ee2354877ad5740dd1d399aba31d31dfb381589194866235f2f252ea52c9e7528ff54d SHA512 e1e708c7b18c4ca5b5a0ed461a5201f5fdaa8f910948fc0cff760d0e0fb8a5edcbd52889def990dbcfb189ecf3a8716691cd23ff46640ff0f099886df77c60a3

dev-java/gradle-bin/gradle-bin-6.3_rc3.ebuild

+# Copyright 1999-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit java-pkg-2
+
+IUSE="source doc examples"
+
+MY_PN=${PN%%-bin}
+MY_P="${MY_PN}-${PV/_rc/-rc-}"
+
+DESCRIPTION="A project automation and build tool with a Groovy based DSL"
+SRC_URI="https://downloads.gradle-dn.com/distributions/${MY_P}-all.zip -> ${P}.zip"
+HOMEPAGE="http://www.gradle.org/"
+
+LICENSE="Apache-2.0"
+SLOT="${PV}"
+KEYWORDS="~amd64 ~x86"
+
+RDEPEND="
+	>=virtual/jdk-1.6"
+
+DEPEND="
+	app-arch/zip
+	>=virtual/jre-1.6"
+
+S="${WORKDIR}/${MY_P}"
+
+src_install() {
+	local gradle_dir="${EPREFIX}/usr/share/${PN}-${SLOT}"
+
+	dodoc docs/release-notes.html getting-started.html
+
+	insinto "${gradle_dir}"
+
+	# source
+	if use source ; then
+		java-pkg_dosrc src/*
+	fi
+
+	# docs
+	if use doc ; then
+		java-pkg_dojavadoc docs/javadoc
+	fi
+
+	# examples
+	if use examples ; then
+		java-pkg_doexamples samples
+	fi
+
+	insinto "${gradle_dir}"
+	doins -r bin/ lib/
+	fperms 755 "${gradle_dir}/bin/gradle"
+	dosym "${gradle_dir}/bin/gradle" "/usr/bin/${MY_PN}-${SLOT}"
+}

dev-java/gradle-bin/metadata.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+  <maintainer type="person">
+    <email>chainsaw@gentoo.org</email>
+    <name>Tony Vroon</name>
+  </maintainer>
+  <maintainer type="person">
+    <email>flo@geekplace.eu</email>
+  </maintainer>
+  <maintainer type="project">
+    <email>java@gentoo.org</email>
+    <name>Java</name>
+  </maintainer>
+</pkgmetadata>