For some reason when I set USB_CFG_HAVE_INTRIN_ENDPOINT3 to 0 I get this.
usbdrv/usbdrvasm.o:usbdrv/asmcommon.inc:180: undefined reference to `usbTxStatus3'
usbdrv/usbdrvasm.o:usbdrv/asmcommon.inc:183: undefined reference to `usbTxStatus3'
usbdrv/usbdrvasm.o:usbdrv/asmcommon.inc:184: undefined reference to `usbTxStatus3'
usbdrv/usbdrvasm.o:usbdrv/asmcommon.inc:185: undefined reference to `usbTxStatus3'