Windows: Fix overflow when handling HID or composite devices

Windows: Fix overflow when handling HID or composite devices

* When libusb_get_device_list() is called mutliple times, the HID device
  path was unconditionally duplicated in the list of device's interfaces.
* Because array boundaries were not checked, this caused overflow and crash.
* This patch adds an out of bound check and also ensures that duplication
  of data, for HID and composite, does not occur
* It also renames the private composite_api_flags to api_flags, as well as
  reorganizes the private attributes
* Bug report and part of the fix provided by Toby Gray