Add synfigstudio 1.4.0

Original ebuilds are from bgo-overlay and eroen
Upstream appeares to have switched to autoconf

dev-cpp/ETL/ETL-1.4.0.ebuild

@@ -0,0 +1,18 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit autotools
+
+DESCRIPTION="ETL is a multi-platform class and template library"
+HOMEPAGE="http://synfig.org"
+SRC_URI="https://github.com/synfig/synfig/releases/download/v${PV}/${P}.tar.gz"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE=""
+
+DEPEND=""
+RDEPEND="${DEPEND}"

dev-cpp/ETL/Manifest

@@ -0,0 +1 @@
+DIST ETL-1.4.0.tar.gz 271199 BLAKE2B 7741d06589af4b4353bea746beaa1660f3434c528e87bbd65589209d5bd6d6d41326997ff1379a67fb4fe0cc00d3166646e578b85698523d371c35c3e4c941dc SHA512 e94a04a3c2e7c6ce786df984c782f673e1796a33f16b09cba172579a0d5044c369e4c44dc81b2ed35543c121538313dc98a0bc492794d8e6ed9ebe238666abf7

dev-cpp/ETL/metadata.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+<maintainer type="person">
+	<email>ceamac.paragon@gmail.com</email>
+	<description>Primary maintainer</description>
+</maintainer>
+</pkgmetadata>