package/netdata: add libcap optional dependency

libcap is an optional dependency which is enabled by default since the
addition of the package in commit
1d2bb469078b5818aa2390b9868cd632200f17a2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/netdata/netdata.mk

@@ -33,6 +33,13 @@ else
 NETDATA_CONF_OPTS += --disable-jsonc
 endif
 
+ifeq ($(BR2_PACKAGE_LIBCAP),y)
+NETDATA_CONF_OPTS += --with-libcap
+NETDATA_DEPENDENCIES += libcap
+else
+NETDATA_CONF_OPTS += --without-libcap
+endif
+
 ifeq ($(BR2_PACKAGE_NFACCT),y)
 NETDATA_CONF_OPTS += --enable-plugin-nfacct
 NETDATA_DEPENDENCIES += nfacct