sys-apps/kexec-tools: Apply CoreOS changes

Just add a fix for arm64.  This package can be moved back to
portage-stable when syncing to a newer upstream release.

sdk_container/src/third_party/coreos-overlay/sys-apps/kexec-tools/files/kexec-tools-2.0.16-arm64-no-PIC.patch

@@ -0,0 +1,27 @@
+From 9d291e5a9425e23dd90c6fd79081bafd5bcd4c32 Mon Sep 17 00:00:00 2001
+From: David Michael <david.michael@coreos.com>
+Date: Sun, 7 Jan 2018 11:05:06 -0500
+Subject: [PATCH] arm64: Set -fno-PIC along with -mcmodel=large
+
+As seen in GCC's gcc/config/aarch64/aarch64.c, -fPIC with large
+code model is unsupported.  This fixes the "sorry, unimplemented"
+errors when building with compilers defaulting to -fPIC.
+---
+ purgatory/arch/arm64/Makefile | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/purgatory/arch/arm64/Makefile b/purgatory/arch/arm64/Makefile
+index 636abea..80068ca 100644
+--- a/purgatory/arch/arm64/Makefile
++++ b/purgatory/arch/arm64/Makefile
+@@ -1,6 +1,7 @@
+ 
+ arm64_PURGATORY_EXTRA_CFLAGS = \
+ 	-mcmodel=large \
++	-fno-PIC \
+ 	-fno-stack-protector \
+ 	-fno-asynchronous-unwind-tables \
+ 	-Wundef \
+-- 
+2.14.3
+

sdk_container/src/third_party/coreos-overlay/sys-apps/kexec-tools/kexec-tools-2.0.16.ebuild

@@ -33,6 +33,7 @@ CONFIG_CHECK="~KEXEC"
 PATCHES=(
 	"${FILESDIR}"/${PN}-2.0.4-disable-kexec-test.patch
 	"${FILESDIR}"/${PN}-2.0.4-out-of-source.patch
+	"${FILESDIR}"/${P}-arm64-no-PIC.patch
 )
 
 pkg_setup() {