change dependency of gitlab-ce on libgit2 to libgit2:0/24, and add ebuild for libgit2-0.24.0_rc1

dev-libs/libgit2/Manifest

@@ -0,0 +1,4 @@
+AUX libgit2-0.24.0_rc1-fix-version.patch 529 SHA256 b1726938ed7ac9dc744bad1c3894816defcf652e080f354f6e90253c1387d754 SHA512 a8db6a63781ce4fdc40f9f9eca193e8b4e8a6cc6a9fb547632f1d53483005cbae06fe35cf96768c0c577a4de1226e06c8a003cee4e1c6e1f3a328dbd7f44798b WHIRLPOOL ce13a604c0a555e05b10269c35b24eba3d0286254fc4c132d244b61479dc1d98f293babe7b3fbf24ee5cc0f6bef33db0ebc238a8e6078bd40e641b2077f8189c
+DIST libgit2-0.24.0_rc1.tar.gz 4165326 SHA256 e956fb569ddaf2d1d29307b4dc361121160ea7ab052eb3dc1c07b95175cb842d SHA512 c73bee9aaba3a36fca35fa0e3183e5636fa9be2ba98b1b93562f390e5f74b0be817ba73781a13e7ae5f880411465877864ca244ad6ac52ccd89d905d5b103e6c WHIRLPOOL 9d442e2894548462e3bda477bbacf4ac2190e8b9cb8c2b34e443568249b6ab63dd316d267e12fad84acfbfbc0af8aa3674e9c5dd717fa8deac4d07e586f82377
+EBUILD libgit2-0.24.0_rc1.ebuild 1838 SHA256 0fcac9187a311ca7086014839c9b87a67288d3b6043a1c7d9e0dbf25bba1149b SHA512 53648baaae16c63c775909eb426e721ac8d1f3059274a1f46eb0f3aa2331e7db3327346964c16d770a1bd6307f204d1136de682e29206d7aed6c5eaa304c1aa7 WHIRLPOOL 0820061b5c98811fa5d61a9fb753dd52983b475b975c2576c44e3a84a0dd298a000c4f13399b7d2c65d011d8f030ef5cde0f1b319263c9e004ffd39f3cd64aba
+MISC metadata.xml 802 SHA256 446c2a35f3209339e906828d8250d3d784cb3796c4da5740cbd6ebf301d92f4a SHA512 9d2dba83bfd1791e2cf2afd2b939ed66456e4db0723f2789ea3b1227e14b0a7d685d9a7adcaae050b6574e99a9301ff1c484b024dbf8e3dcd44e56a14d84ee99 WHIRLPOOL 268fb7c0d932e4c7b8ce4554c2d04341c77eba94ba25066746b7289111e76446f3c411efc454b3a639aaa98b67c030392c6fab77185f8bc9dac4dce9b4a47e36

dev-libs/libgit2/files/libgit2-0.24.0_rc1-fix-version.patch

@@ -0,0 +1,20 @@
+diff --git a/include/git2/version.h b/include/git2/version.h
+index 6837e90..7572da1 100644
+--- a/include/git2/version.h
++++ b/include/git2/version.h
+@@ -7,12 +7,12 @@
+ #ifndef INCLUDE_git_version_h__
+ #define INCLUDE_git_version_h__
+ 
+-#define LIBGIT2_VERSION "0.23.0"
++#define LIBGIT2_VERSION "0.24.0-rc1"
+ #define LIBGIT2_VER_MAJOR 0
+-#define LIBGIT2_VER_MINOR 23
++#define LIBGIT2_VER_MINOR 24
+ #define LIBGIT2_VER_REVISION 0
+ #define LIBGIT2_VER_PATCH 0
+ 
+-#define LIBGIT2_SOVERSION 23
++#define LIBGIT2_SOVERSION 24
+ 
+ #endif

dev-libs/libgit2/libgit2-0.24.0_rc1.ebuild

@@ -0,0 +1,81 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=5
+
+inherit cmake-utils multilib
+
+MY_PV=${PV/_/-}
+
+if [[ ${PV} == "9999" ]] ; then
+	EGIT_REPO_URI="https://github.com/${PN}/${PN}.git"
+	inherit git-r3
+else
+	SRC_URI="https://github.com/${PN}/${PN}/archive/v${MY_PV}.tar.gz -> ${P}.tar.gz"
+	KEYWORDS="amd64 ~arm ~x86 ~ppc-macos"
+fi
+
+DESCRIPTION="A linkable library for Git"
+HOMEPAGE="https://libgit2.github.com/"
+
+LICENSE="GPL-2-with-linking-exception"
+SLOT="0/24"
+IUSE="examples gssapi libressl ssh test threads trace"
+
+S="${WORKDIR}/${PN}-${MY_PV}"
+
+RDEPEND="
+	!libressl? ( dev-libs/openssl:0 )
+	libressl? ( dev-libs/libressl )
+	sys-libs/zlib
+	net-libs/http-parser:=
+	gssapi? ( virtual/krb5 )
+	ssh? ( net-libs/libssh2 )
+"
+DEPEND="${RDEPEND}
+	virtual/pkgconfig
+"
+
+DOCS=( AUTHORS CONTRIBUTING.md CONVENTIONS.md README.md )
+
+src_prepare() {
+	# skip online tests
+	sed -i '/libgit2_clar/s/-ionline/-xonline/' CMakeLists.txt || die
+
+	epatch "${FILESDIR}/${P}-fix-version.patch"
+	cmake-utils_src_prepare
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DLIB_INSTALL_DIR="${EPREFIX}/usr/$(get_libdir)"
+		$(cmake-utils_use_build test CLAR)
+		$(cmake-utils_use_enable trace TRACE)
+		$(cmake-utils_use_use gssapi GSSAPI)
+		$(cmake-utils_use_use ssh SSH)
+		$(cmake-utils_use threads THREADSAFE)
+	)
+	cmake-utils_src_configure
+}
+
+src_test() {
+	if [[ ${EUID} -eq 0 ]] ; then
+		# repo::iterator::fs_preserves_error fails if run as root
+		# since root can still access dirs with 0000 perms
+		ewarn "Skipping tests: non-root privileges are required for all tests to pass"
+	else
+		local TEST_VERBOSE=1
+		cmake-utils_src_test
+	fi
+}
+
+src_install() {
+	cmake-utils_src_install
+
+	if use examples ; then
+		egit_clean examples
+		dodoc -r examples
+		docompress -x /usr/share/doc/${PF}/examples
+	fi
+}

dev-libs/libgit2/metadata.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>manuel@fritteli.ch</email>
+		<name>Manuel Friedli</name>
+	</maintainer>
+	<longdescription lang="en">
+		libgit2 is a portable, pure C implementation of the Git core methods provided
+		as a re-entrant linkable library with a solid API, allowing you to write native
+		speed custom Git applications in any language which supports C bindings.
+	</longdescription>
+	<use>
+		<flag name="gssapi">Enable GSSAPI support for SPNEGO auth</flag>
+		<flag name="ssh">Enable SSH transport support</flag>
+		<flag name="trace">Enable tracing support</flag>
+	</use>
+	<upstream>
+		<remote-id type="github">libgit2/libgit2</remote-id>
+	</upstream>
+</pkgmetadata>