compile usb server on kernel >=2.6.36

Hi,

usb server for the linux vworksapce connector doesn't compile in kernel >=2.6.36 due to it uses a deprecated ioctl system call.

To solve it, you can change the deprecated system ioctl call to unlocked_ioctl.

A sample patch than can help to change the system call can be found here:

http://www.incentivespro.com/forum/viewtopic.php?t=512

I think it can be useful to improve the linux vworkspace connector