avahi: drop unneeded avahi-autopid patch

The reason for the patch is not entirely clear as it dates back to the
original addition of avahi (in 2006), and it contains no description - But
presumably it is to work around a permission issue with the address files,
similar to what is explained here:

https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/83521

That particular issue got fixed by upstream in 2007 using umask(2):

https://github.com/lathiat/avahi/commit/747f75372063371865bf5fc9857982defcffdca4



So the patch isn't needed any more and can be dropped.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>