add some noreturn annotations

code/qcommon/vm_x86.c

@@ -381,7 +381,7 @@ Error handler for jump/call to invalid instruction number
 =================
 */
 
-static void ErrJump(void)
+static void __attribute__((__noreturn__)) ErrJump(void)
 { 
 	Com_Error(ERR_DROP, "program tried to execute code outside VM");
 	exit(1);