Revert protocol 69 pending further discussion (#4962)

code/client/client.h

@@ -260,10 +260,6 @@ typedef struct {
 	float voipPower;
 #endif
 
-#ifdef PROTOCOL_SUPPORT_OLD
-	qboolean compat;
-#endif
-
 	// big stuff at end of structure so most offsets are 15 bits or less
 	netchan_t	netchan;
 } clientConnection_t;