disable-common.inc: add missing dns tools (#3828)

Add the missing binaries in the DNS section, as suggested by @glitsj16:
https://github.com/netblue30/firejail/pull/3810#issuecomment-742920539

Packages and their relevant binaries:

* bind: dnssec-*
* knot: khost
* unbound: unbound-host

1 files changed, 3 insertions, 0 deletions

diff --git a/etc/inc/disable-common.inc b/etc/inc/disable-common.inc
index 2b56bb5be..d88506d90 100644
--- a/etc/inc/disable-common.inc
+++ b/etc/inc/disable-common.inc
@@ -517,16 +517,19 @@ blacklist /proc/config.gz
 blacklist ${PATH}/dig
 blacklist ${PATH}/dlint
 blacklist ${PATH}/dns2tcp
+blacklist ${PATH}/dnssec-*
 blacklist ${PATH}/dnswalk
 blacklist ${PATH}/drill
 blacklist ${PATH}/host
 blacklist ${PATH}/iodine
 blacklist ${PATH}/kdig
+blacklist ${PATH}/khost
 blacklist ${PATH}/knsupdate
 blacklist ${PATH}/ldns-*
 blacklist ${PATH}/ldnsd
 blacklist ${PATH}/nslookup
 blacklist ${PATH}/resolvectl
+blacklist ${PATH}/unbound-host
 
 # rest of ${RUNUSER}
 blacklist ${RUNUSER}/*.lock