Optlink doesn't work on shared folder in VirtualBox

**Transferred from**: https://issues.dlang.org/show_bug.cgi?id=10780

User @jacob-carlborg reported (2013-08-08 10:10:38 CEST):
> I have a VirtualBox machine running Windows XP. I have setup a shared folder, with full access. Anything I compile in that shared folder, in the virtual machine, will fail with the following error from Optlink:
> ```console
> Error 62: Critical Write
> ```