x86_64: don't call early_vgacon_init() if fbcon kext is not compiled in

arch/x86_64/init.c

@@ -107,7 +107,9 @@ int ml_init(uintptr_t arg)
 	init_bootfb(mb);
 
 	bootstrap_cpu_init();
+#ifdef KEXT_NET_DOORSTUCK_SOCKS_FBCON
 	early_vgacon_init();
+#endif
 	serialcon_init(115200);
 	clock_calibrate(500);