avahi: update to 0.8

Clean up Makefile slightly.

Update configure options for the new version.

Remove first patch and update the other one.

Use a different solution for the stack protector on certain platforms.

Run script through shellcheck. Small quote fix.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry picked from commit 9290d41077)

libs/avahi/files/netifd-autoip.sh

@@ -9,7 +9,7 @@ proto_autoip_setup() {
 	local iface="$2"
 
 	proto_export "INTERFACE=$config"
-	proto_run_command "$config" avahi-autoipd $iface
+	proto_run_command "$config" avahi-autoipd "$iface"
 }
 
 proto_autoip_teardown() {