Change C4Network2UPnPP forward declaration to class

src/network/C4Network2UPnP.h

@@ -21,7 +21,7 @@
 
 class C4Network2UPnP
 {
-	struct C4Network2UPnPP *p;
+	class C4Network2UPnPP *p;
 public:
 	C4Network2UPnP();
 	//noncopyable

src/network/C4Network2UPnPWin32.cpp

@@ -48,8 +48,9 @@ namespace
 	}
 }
 
-struct C4Network2UPnPP
+class C4Network2UPnPP
 {
+public:
 	bool MustReleaseCOM;
 
 	// NAT