kernel-wfp: Add support for tunnel mode connections

src/libcharon/plugins/kernel_wfp/kernel_wfp_compat.h

@@ -45,4 +45,14 @@
 #define IPSEC_TRANSFORM_ESP_AUTH_FW				5
 #define IPSEC_TRANSFORM_TYPE_MAX				6
 
+/* missing in MinGW */
+enum {
+	FWPM_TUNNEL_FLAG_POINT_TO_POINT = 						(1<<0),
+	FWPM_TUNNEL_FLAG_ENABLE_VIRTUAL_IF_TUNNELING =			(1<<1),
+};
+
+DWORD WINAPI FwpmIPsecTunnelAdd0(HANDLE, UINT32,
+	const FWPM_PROVIDER_CONTEXT0*, const FWPM_PROVIDER_CONTEXT0*, UINT32,
+	const FWPM_FILTER_CONDITION0*, PSECURITY_DESCRIPTOR);
+
 #endif /** KERNEL_WFP_COMPAT_H_ @}*/