newlib: require autoconf-2.69

[Mike Frysinger]

On 11 Jan 2022 11:23, Corinna Vinschen wrote:
> IOW, let's utilize override.m4 and bump _GCC_AUTOCONF_VERSION to 2.69.
> Is that ok?

sure.  i need this series approved first:
https://sourceware.org/pipermail/newlib/2022/018800.html

newlib's override.m4 is currently pinned to 2.64, and that series pulls
in all the updates to get us to 2.69.
-mike
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