HOME variable containing /home path.
Cygwin establishes a HOME environment variable containing
a path that is unresolvable in native Windows applications.
This path is passed down and may confuse some programs; particularly
programs ported to Windows from Unix which use the HOME
variable if it is present.
A notable example of this is the Windows
native version of Vim. When Vim is spawned from Cygwin, it tries to
look for the _vimrc file in the directory indicated by
HOME, and also store _viminfo there.
The user is met with error messages.
On Cygnal, we want HOME either not to be established
or else to have the same contents as USERPROFILE.
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