strongswan: scripts need charon or tools

Fixes:
http://autobuild.buildroot.net/results/007/007e75362cbe4693e36d5a7ab96c539d1f3b00fc/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/strongswan/Config.in

@@ -110,6 +110,7 @@ config BR2_PACKAGE_STRONGSWAN_TOOLS
 
 config BR2_PACKAGE_STRONGSWAN_SCRIPTS
 	bool "Enable additional utilities (found in directory scripts)"
+	depends on BR2_PACKAGE_STRONGSWAN_CHARON || BR2_PACKAGE_STRONGSWAN_TOOLS
 	default y
 
 endif