examples/shutdown-1.0: an example of reboot which does not signal init

For one, my inits know nothing about the concept of "shutting down the system".

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

examples/shutdown-1.0/script/hardshutdown.make.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+gcc -Wall -Os -o hardshutdown hardshutdown.c
+strip hardshutdown
+
+#or:
+#diet gcc -Wall -o hardshutdown hardshutdown.c
+#elftrunc hardshutdown