dev-embedded/arduino-ctags: new package

This package is needed for the bump of dev-embedded/arduino to 1.8.5. It
uses its own private fork of ctags and when using dev-util/ctags,
arduino produces non-functioning executables.

Bug: https://bugs.gentoo.org/525882
Package-Manager: Portage-2.3.19, Repoman-2.3.6

dev-embedded/arduino-ctags/Manifest

@@ -0,0 +1 @@
+DIST arduino-ctags-20161123.tar.gz 490200 BLAKE2B f51b18a0db420124c5fed2b320c16d9eeb96fce6d0f118cf43a8177f88400daaeb83437c3993353c16b73781961c7476e782e66891582f4b3dc5301c73da64dc SHA512 ae5bde92c3dd0b9a179bc1df998f20312c4ab8b2c9c1840dbe543d23fb4531b9e5524f1399d9922ed9b2de4582bdb74635f7ec576a42c808d152c3fbb84f9687

dev-embedded/arduino-ctags/arduino-ctags-20161123.ebuild

@@ -0,0 +1,30 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+COMMITHASH="abc8fca7499f44c725122881cd380a88c37abe0e"
+
+DESCRIPTION="Arduino private fork of dev-util/ctags"
+HOMEPAGE="https://github.com/arduino/ctags"
+SRC_URI="https://github.com/arduino/ctags/archive/${COMMITHASH}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+S="${WORKDIR}/ctags-${COMMITHASH}"
+
+src_configure() {
+	econf \
+		--disable-readlib \
+		--disable-etags \
+		--enable-tmpdir="${EPREFIX}"/tmp
+}
+
+src_install() {
+	# This package compiles into a "ctags" executable, but don't want to clash into
+	# actually legitimate ctags implementations.
+	mv ctags arduino-ctags
+	dobin arduino-ctags
+}

dev-embedded/arduino-ctags/metadata.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>[email protected]</email>
+		<name>Embedded Gentoo</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">arduino/ctags</remote-id>
+	</upstream>
+	<longdescription>
+		Arduino's build process includes a preprocessing phase that involves ctags,
+		but not any version of ctags, *Arduino's* ctags, a private fork that
+		Arduino maintains. We can't use dev-util/ctags because it causes Arduino
+		to produce corrupt executables.
+	</longdescription>
+</pkgmetadata>