add gentoo-sources-4.8.15

zfs-0.6.5.8 does not support kernel 4.9

sys-kernel/gentoo-sources/gentoo-sources-4.8.15.ebuild

@@ -0,0 +1,29 @@
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI="5"
+ETYPE="sources"
+K_WANT_GENPATCHES="base extras experimental"
+K_GENPATCHES_VER="17"
+
+inherit kernel-2
+detect_version
+detect_arch
+
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86"
+HOMEPAGE="https://dev.gentoo.org/~mpagano/genpatches"
+IUSE="experimental"
+
+DESCRIPTION="Full sources including the Gentoo patchset for the ${KV_MAJOR}.${KV_MINOR} kernel tree"
+SRC_URI="${KERNEL_URI} ${GENPATCHES_URI} ${ARCH_URI}"
+
+pkg_postinst() {
+	kernel-2_pkg_postinst
+	einfo "For more info on this patchset, and how to report problems, see:"
+	einfo "${HOMEPAGE}"
+}
+
+pkg_postrm() {
+	kernel-2_pkg_postrm
+}