dbus: moved to github

git-svn-id: svn://svn.openwrt.org/openwrt/packages@41728 3c298f89-4303-0410-b956-a3cf2f4a3e73
libsigc++: moved to github

git-svn-id: svn://svn.openwrt.org/openwrt/packages@41729 3c298f89-4303-0410-b956-a3cf2f4a3e73