ObjectTypeDB was renamed to ClassDB. Types are meant to be more generic to Variant.

All usages of "type" to refer to classes were renamed to "class"
ClassDB has been exposed to GDScript.
OBJ_TYPE() macro is now GDCLASS()

drivers/unix/ip_unix.h

@@ -34,7 +34,7 @@
 #if defined(UNIX_ENABLED) || defined(WINDOWS_ENABLED)
 
 class IP_Unix : public IP {
-	OBJ_TYPE(IP_Unix, IP);
+	GDCLASS(IP_Unix, IP);
 
 	virtual IP_Address _resolve_hostname(const String& p_hostname, IP::Type p_type);