package/bind: remove /usr/sbin/tsig-keygen if server is not selected

Otherwise it is left as a dangling symlink to ddns-confgen, which is
also removed.

Signed-off-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/bind/bind.mk

@@ -18,7 +18,7 @@ BIND_TARGET_SERVER_SBIN += dnssec-settime dnssec-verify genrandom
 BIND_TARGET_SERVER_SBIN += isc-hmac-fixup named-journalprint nsec3hash
 BIND_TARGET_SERVER_SBIN += lwresd named named-checkconf named-checkzone
 BIND_TARGET_SERVER_SBIN += named-compilezone rndc rndc-confgen dnssec-dsfromkey
-BIND_TARGET_SERVER_SBIN += dnssec-keyfromlabel dnssec-signzone
+BIND_TARGET_SERVER_SBIN += dnssec-keyfromlabel dnssec-signzone tsig-keygen
 BIND_TARGET_TOOLS_BIN = dig host nslookup nsupdate
 BIND_CONF_ENV = \
 	BUILD_CC="$(TARGET_CC)" \