macOS version detection broken in configure

[Niels Möller]

Carlo Cabrera <carlo.cabrera at me.com> writes:

> The configure script mistakenly recognises macOS 11 (Big Sur) as an old version
> of macOS, thereby choosing the linker flags `-flat_namespace` and `-undefined suppress`.
>
> We want to avoid `-flat_namespace` as this can cause name collisions for users
> of the library. [1]
>
> This can be fixed by patching libtool.m4 [2] and regenerating configure.

When it is fixed upstream in libtool (what's the current status?), gmp
can upgrade to a fixed version. I don't think gmp will carry patched
versions of libtool files.

If there's something that needs fixing in gmp's configure.ac, it's a
different matter.

Regards,
/Niels

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