Fix compilation errors with libstdc++v3 for AVR target and allow --enable-libstdcxx

[Felipe Magno de Almeida]

On Thu, Nov 10, 2016 at 1:39 PM, Felipe Magno de Almeida
<felipe.m.almeida@gmail.com> wrote:
> Hello,
>
> Sorry for top-posting, but this is a ping for the attached patch.
>
> The patch doesn't seem to have been applied nor refused. So I'm
> pinging to see if I need to change something? I already have a
> copyright assignment now.
>
> I'm attaching a updated patch that doesn't conflict in the Changelog
> file.

Reattaching the patch with the correct git commit descriptions.

> Regards,

[snip]

> --
> Felipe Magno de Almeida

Kind regards,
-- 
Felipe Magno de Almeida
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