strongswan: quote 'comment' parameter in Config.in

Newer versions of the kconfig generator require quotes.  Prepare the
package for an eventual update.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

net/strongswan/Config.in

@@ -1,6 +1,6 @@
 
 if PACKAGE_strongswan
-comment Configuration
+comment "Configuration"
 
 # --with-routing-table
 config STRONGSWAN_ROUTING_TABLE
@@ -14,6 +14,6 @@ config STRONGSWAN_ROUTING_TABLE_PRIO
 	prompt "Set the IPsec routing table priority"
 	default "220"
 
-comment Packages
+comment "Packages"
 
 endif