Add support for Mustek P3600 Pro
Currently this scanner is unusable on Ubuntu 18.04:
sudo sane-find-scanner -q
found USB scanner (vendor=0x055f [USB Scanner], product=0x0401 [USB Scanner]) at libusb:002:002
sudo scanimage -L
device `gt68xx:libusb:002:002' is a unknown manufacturer unknown device -- use override to select flatbed scanner
I found this old patch but I want not to try to use it on an new linux realease.
this old post in german seems to be interesting.
Edited by Lafricain