envfs: provide an intentional way to ignore an existing external environment

[Jan Lübbe]

Hi Jürgen!

This looks good so far.

On Wed, 2014-07-30 at 12:20 +0200, Juergen Borleis wrote:
> This change set adds a new option to the saveenv command which will
> write an empty environment without content. But it will be marked as a
> placeholder and thus should be "ignored" and barebox falls back to its
> built-in default environment.

I haven't found where the environment loading is changed to implement
this behavior. Is a patch missing?

Thanks,
Jan
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