libusb: implement libusb_pollfds_handle_timeouts

[aokblast]

Summary

This function tell applications who maintains the pollfds themselves if
they should handle the timeout for each xfer themselves. In FreeBSD, the
timeout for each xfer is handle by kernel and no need a special timer to
do it. Therefore, we return 1 to indicate that it is handle by libusb
internally.

[lwhsu]

For the commit message:

• This function tell -> This function tells
• is handle by kernel -> is handled by kernel
• no need a special timer -> doesn't need a special timer
• it is handle by libusb -> it is handled by libusb

lib/libusb/libusb.3

738

[markj]

lib/libusb/libusb.3

738

739

[aokblast]

Fix manual

[markj]

lib/libusb/libusb.3

738