engine: fix UTF-8 sequence input

Fixes: 2e0fc3e4c1 ("engine: client: do not repeatedly check cl_charset value, use generic Con_UtfProcessChar")

engine/client/client.h

@@ -632,6 +632,9 @@ typedef struct
 	int extensions;
 
 	netadr_t serveradr;
+
+	// do we accept utf8 as input
+	qboolean accept_utf8;
 } client_static_t;
 
 #ifdef __cplusplus