unrar: moved to github

git-svn-id: svn://svn.openwrt.org/openwrt/packages@41157 3c298f89-4303-0410-b956-a3cf2f4a3e73
unzip: move to github

git-svn-id: svn://svn.openwrt.org/openwrt/packages@41158 3c298f89-4303-0410-b956-a3cf2f4a3e73
zip: move to github

git-svn-id: svn://svn.openwrt.org/openwrt/packages@41159 3c298f89-4303-0410-b956-a3cf2f4a3e73