ntp: fix missing optional dependencies

ntpq and ntpdc may depends on libedit and libcap.

$ arm-linux-readelf -d ./usr/bin/ntpdc | grep NEEDED
 0x00000001 (NEEDED)                     Shared library: [libcap.so.2]
 0x00000001 (NEEDED)                     Shared library: [libm.so.6]
 0x00000001 (NEEDED)                     Shared library: [libedit.so.0]
 0x00000001 (NEEDED)                     Shared library: [libncursesw.so.6]
 0x00000001 (NEEDED)                     Shared library: [libssl.so.1.0.0]
 0x00000001 (NEEDED)                     Shared library: [libcrypto.so.1.0.0]
 0x00000001 (NEEDED)                     Shared library: [libpthread.so.0]
 0x00000001 (NEEDED)                     Shared library: [libc.so.6]

However, build order with these libraries is not defined.

In order to keep things simple, we enforce build order even if ntpq/ntpdc are
not selected.

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
[Thomas: use --without-lineeditlibs.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ntp/ntp.mk

@@ -28,6 +28,20 @@ else
 NTP_CONF_OPTS += --without-crypto --disable-openssl-random
 endif
 
+ifeq ($(BR2_PACKAGE_LIBCAP),y)
+NTP_CONF_OPTS += --enable-linuxcaps
+NTP_DEPENDENCIES += libcap
+else
+NTP_CONF_OPTS += --disable-linuxcaps
+endif
+
+ifeq ($(BR2_PACKAGE_LIBEDIT),y)
+NTP_CONF_OPTS += --with-lineeditlibs=edit
+NTP_DEPENDENCIES += libedit
+else
+NTP_CONF_OPTS += --without-lineeditlibs
+endif
+
 ifeq ($(BR2_PACKAGE_NTP_NTPSNMPD),y)
 NTP_CONF_OPTS += \
 	--with-net-snmp-config=$(STAGING_DIR)/usr/bin/net-snmp-config