ntp: enable/disable sntp support depending on BR2_PACKAGE_NTP_SNTP

We already have an option for selecting sntp support in ntp that can be
chosen from the menuconfig, and ntp's configure script has a --with-sntp
option (with its --without counterpart) which can be used for disabling
sntp support in ntp. However, we are not using it. This patch will make
use of it.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ntp/ntp.mk

@@ -65,6 +65,12 @@ else
 NTP_CONF_OPTS += --disable-SHM
 endif
 
+ifeq ($(BR2_PACKAGE_NTP_SNTP),y)
+NTP_CONF_OPTS += --with-sntp
+else
+NTP_CONF_OPTS += --without-sntp
+endif
+
 NTP_INSTALL_FILES_$(BR2_PACKAGE_NTP_NTP_KEYGEN) += util/ntp-keygen
 NTP_INSTALL_FILES_$(BR2_PACKAGE_NTP_NTP_WAIT) += scripts/ntp-wait/ntp-wait
 NTP_INSTALL_FILES_$(BR2_PACKAGE_NTP_NTPDATE) += ntpdate/ntpdate