- Implement dual protocol support (#4962)

- Fix several UDP spoofing security issues

code/client/client.h

@@ -263,6 +263,10 @@ typedef struct {
 	float voipPower;
 #endif
 
+#ifdef LEGACY_PROTOCOL
+	qboolean compat;
+#endif
+
 	// big stuff at end of structure so most offsets are 15 bits or less
 	netchan_t	netchan;
 } clientConnection_t;