package/dhcp: add explicit option disabling

Commits 4db37c663cc0 (dhcp: add config option for delayed-ack feature
of dhcp server) and 40f7adae3c03 (package/dhcp: add security options to
DHCP server) forgot to explicit disable the option when not requested.

Fix that now.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Andreas Ehmanns <universeiii@gmx.de>
Cc: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Cc: Thomas De Schampheleire <patrickdepinguin+buildroot@gmail.com>
Cc: Jan Havran <havran.jan@email.cz>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/dhcp/dhcp.mk

@@ -76,10 +76,14 @@ endif
 
 ifeq ($(BR2_PACKAGE_DHCP_SERVER_DELAYED_ACK),y)
 DHCP_CONF_OPTS += --enable-delayed-ack
+else
+DHCP_CONF_OPTS += --disable-delayed-ack
 endif
 
 ifeq ($(BR2_PACKAGE_DHCP_SERVER_ENABLE_PARANOIA),y)
 DHCP_CONF_OPTS += --enable-paranoia
+else
+DHCP_CONF_OPTS += --disable-paranoia
 endif
 
 define DHCP_INSTALL_LIBS