Register PKCS#8 builder for KEY_ANY

src/libstrongswan/plugins/pkcs8/pkcs8_plugin.c

@@ -43,6 +43,7 @@ METHOD(plugin_t, get_features, int,
 {
 	static plugin_feature_t f[] = {
 		PLUGIN_REGISTER(PRIVKEY, pkcs8_private_key_load, FALSE),
+			PLUGIN_PROVIDE(PRIVKEY, KEY_ANY),
 			PLUGIN_PROVIDE(PRIVKEY, KEY_RSA),
 			PLUGIN_PROVIDE(PRIVKEY, KEY_ECDSA),
 	};