network/services/lldpd: Fix missing dependency when using JSON

Using the JSON output option depends on json library so
add select json-c library when JSON output is selected.

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

SVN-Revision: 47928

package/network/services/lldpd/Config.in

@@ -49,6 +49,7 @@ config LLDPD_WITH_CUSTOM
 config LLDPD_WITH_JSON
 	bool
 	prompt "Enable JSON output for the LLDP Command-Line Interface"
+	select PACKAGE_json-c
 	default n
 
 endmenu