openrc|systemd: adapt install paths of scripts to /usr merge

The Makefile was previously changed to install the scripts according to the /usr merge (MR !4 (merged)). As the service files point to the scripts, the paths need to be adapted there as well.

openrc/swclock-offset-boot.initd

@@ -13,7 +13,7 @@ depend()
 start()
 {
 	ebegin "Setting system time"
-	/sbin/swclock-offset-boot
+	/usr/bin/swclock-offset-boot
 	eend $?
 }