Added support for iKEIntermediate X.509 extended key usage flag.

Mac OS X requires server certificates to have this flag set.

src/libstrongswan/credentials/certificates/x509.h

@@ -56,6 +56,8 @@ enum x509_flag_t {
 	X509_IP_ADDR_BLOCKS =	(1<<6),
 	/** cert has CRL sign key usage */
 	X509_CRL_SIGN =			(1<<7),
+	/** cert has iKEIntermediate key usage */
+	X509_IKE_INTERMEDIATE =	(1<<8),
 };
 
 /**