nftables variant
* remove firewall4.include file as it is not needed and procuces a firewall
error on service miniupnpd restart
* remove the uci-defaults file as its sole purpose was to install the
firewall include file
* modify the Makefile to reflect the deleted files
Signed-off-by: Stan Grishin <stangri@melmac.ca>
(cherry picked from commit 4c934aea718ceb682551b9bab0a8618e4b12920d)