Make more macro checks ARMv8-M baseline proof

[Christophe Lyon]

I forgot that the suitable format in this project is via git
format-patch, so here is the same patch in that format.

Christophe

On Mon, 1 Apr 2019 at 16:42, Christophe Lyon <christophe.lyon@linaro.org> wrote:
>
> Hi,
>
> After Thomas' patch
> (https://sourceware.org/ml/newlib/2016/msg00017.html), it seems that
> some changes committed to libgloss are missing in newlib.
> I noticed the problem when building a toolchain where GCC is
> configured --with-cpu=cortex-m{0,23}.
>
> This small patch brings the necessary changes from libgloss to newlib.
> With this, the GCC toolchain build completes.
>
> OK?
>
> Thanks,
>
> Christophe
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