[sane-devel] sanei_usb has libusb support now

[Oliver Schwartz]

Hi,

> Linux: I have tested scanning with libusb and some Mustek USB
>   scanners. No problems. Other scanners and sanei_usb_control_msg
>   couldn't be tested. Reports are welcome.

I made some changes to the SnapScan backend to make it libusb compatible. It 
seems to work (including sane-find-scanner) for my Acer 620ut.

One minor annoyance: I thinkt that the type of the "buffer" argument in 
sanei_usb_write_bulk should be changed from "SANE_Byte *" to 
"const SANE_Byte *". 

Regards,

Oliver