7112:
 * bump firmware version to 87.04.88 rev27403 ([http://www.avm.de/de/Sicherheit/hinweis.html security update])
 * compile-tested only
 * refs #2355


git-svn-id: file:///var/svn/freetz/trunk@11772 149334a1-2f27-0410-a3b9-fc62619ac1e6