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}"