strongswan: trivial improvement in 'stroke' packaging

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

net/strongswan/Makefile

@@ -614,14 +614,7 @@ define Plugin/attr-sql/install
 endef
 
 define Plugin/stroke/install
-	$(INSTALL_DIR) $(1)/etc/ipsec.d/aacerts
-	$(INSTALL_DIR) $(1)/etc/ipsec.d/acerts
-	$(INSTALL_DIR) $(1)/etc/ipsec.d/cacerts
-	$(INSTALL_DIR) $(1)/etc/ipsec.d/certs
-	$(INSTALL_DIR) $(1)/etc/ipsec.d/crls
-	$(INSTALL_DIR) $(1)/etc/ipsec.d/ocspcerts
-	$(INSTALL_DIR) $(1)/etc/ipsec.d/private
-	$(INSTALL_DIR) $(1)/etc/ipsec.d/reqs
+	$(INSTALL_DIR) $(1)/etc/ipsec.d/{aacerts,acerts,cacerts,certs,crls,ocspcerts,private,reqs}
 
 	$(INSTALL_DIR) $(1)/usr/lib/ipsec/plugins
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/lib/ipsec/{starter,stroke} $(1)/usr/lib/ipsec/