busybox: add ping6 & traceroute6, thx MaxMuster (refs #1786, closes #2043)

git-svn-id: file:///var/svn/freetz/trunk@10284 149334a1-2f27-0410-a3b9-fc62619ac1e6
 * add new library libev, by roadman17 + minor fixes by me
 * refs #1643


git-svn-id: file:///var/svn/freetz/trunk@10285 149334a1-2f27-0410-a3b9-fc62619ac1e6
freetz_download/git checkout method:
 * add support for git submodules


git-svn-id: file:///var/svn/freetz/trunk@10286 149334a1-2f27-0410-a3b9-fc62619ac1e6