[X2Go-Project] Unplanned Maintenance on the X2Go-WinBuilder VM

[Mike DePaulo]

TL;DR: X2Go Client for Windows builds will be down temporarily.
Hopefully the VM will not be upgraded from Windows 7 to 10 (probably
very disruptive) or have future issues with Windows Updates.

I tried to get dismiss the "Get Windows 10" prompt, but accidentally
started the upgrade.

I am taking steps to both disable the upgrade (so far, so good) and
clean up disk space on C:\

This involves moving the old Cygwin installs from C:\ to D:\.,
including the install where sshd runs from.