dev-cpp/asio: version bump to 1.12.1, add libressl support

Closes: https://bugs.gentoo.org/656458
Closes: https://github.com/gentoo/gentoo/pull/8581

dev-cpp/asio/Manifest

@@ -1 +1,2 @@
 DIST asio-1.10.8.tar.bz2 1270332 BLAKE2B 97e4a6a7c8b4562f10af1d122e9b08c12d567fd0447d1951a907f47f77832dcd42df4cb9b5b392feaaa2ea7c79d8bedfcf12e3052957ec012d8bb6b4d1347eb5 SHA512 d870686d2b19bec9925c311f2f0fd370e9797bbad252176a80a998f9c322ecd502b5081826105712e7caf87c03c3e6b70a0e219019e5bff46077d6e8c3c6db09
+DIST asio-1.12.1.tar.bz2 1444246 BLAKE2B d59b47a4dedd8d0892ace6d93c371cb02e16534b41bd490a945785526ad0a11bd6cb15f205bc5702b5a14780876bd92041bffac2898658b40c78ea27d4f37b14 SHA512 a994e1ee9a252d9f8cc2ada0915a9866eeebdd2b1d9a8fd50fa8db06d5ee6277f44a0f83c79f46f939adca43e02373ffee78ff6b1d6ae1798dcb1cd6d56dc568

dev-cpp/asio/asio-1.12.1.ebuild

@@ -0,0 +1,48 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+DESCRIPTION="Asynchronous Network Library"
+HOMEPAGE="http://asio.sourceforge.net/"
+SRC_URI="mirror://sourceforge/${PN}/${PN}/${P}.tar.bz2"
+
+LICENSE="Boost-1.0"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~ppc ~ppc64 ~sparc ~x86"
+IUSE="doc examples libressl ssl test"
+
+RDEPEND="dev-libs/boost
+	ssl? (
+		!libressl? ( dev-libs/openssl:0= )
+		libressl? ( dev-libs/libressl:0= )
+	)"
+DEPEND="${RDEPEND}"
+
+src_prepare() {
+	default
+
+	if ! use test; then
+		# Don't build nor install any examples or unittests
+		# since we don't have a script to run them
+		cat > src/Makefile.in <<-EOF || die
+			all:
+
+			install:
+
+			clean:
+		EOF
+	fi
+}
+
+src_install() {
+	use doc && local HTML_DOCS=( doc/. )
+	default
+
+	if use examples; then
+		# Get rid of the object files
+		emake clean
+		dodoc -r src/examples
+		docompress -x /usr/share/doc/${PF}/examples
+	fi
+}