Make USB_USBTask() depreciated when INTERRUPT_CONTROL_ENDPOINT is enabled

[NicoHood]

As far as I can see USB_USBTask() manages the control endpoint when it is not handled via interrupts. However if you do use INTERRUPT_CONTROL_ENDPOINT, it is not required and should be removed.

You could then remove the function completely in the lufa source via #ifdef INTERRUPT_CONTROL_ENDPOINT which will result in a compile error. Most users will not know what to do then, why the symbol is missing.

As an alternative you can declare the function as depreciated with a custom text, warning that it is useless when INTERRUPT_CONTROL_ENDPOINT was used.

[NicoHood]

I also notived that the usb task is available in some class drivers. It has to be surrounded by ifdefs too. Example: static int CDC_Device_getchar_Blocking(FILE* Stream)