Fix policycoreutils build

There was still some python leaking into this - skip building sepolicy
to avoid issues with cross-compilation.

sdk_container/src/third_party/coreos-overlay/sys-apps/policycoreutils/policycoreutils-2.4.ebuild

@@ -88,6 +88,8 @@ src_prepare() {
 		# (so we cannot use an additional package for now).
 		S="${S2}"
 		python_copy_sources
+	else
+		sed s/sepolicy// -i Makefile
 	fi
 }