Make GNUPGHOME on Windows to another environment variable?

[Michael Young]

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 > The suggested feature to use the GNUPGHOME environment variable
 > also under Windows will not go into this release because it might
 > break systems where this variable has accidently been set.

If that remains a concern, would you consider looking for another
environment variable that could be used to make the user's intent
clear?  For example, use GNUPGHOME if "GNUPG_IGNORE_WINDOWS_REGISTRY"
is set, or something to that effect.

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