Updating config.guess, config.sub

[Rainer Orth]

I've just updated config.guess and config.sub to current upstream
versions in gcc mainline:

	https://gcc.gnu.org/ml/gcc-patches/2019-01/msg00094.html

I'd like to do the same for the binutils-gdb repo, but am a bit unclear
about the policy.  The toplevel MAINTAINERS file mentions:

config.guess; config.sub; readline/support/config.{sub,guess}
[...]
        Changes need to be done in tandem with the official CONFIG
        sources or submitted to the master file maintainer and brought
        in via a merge.  When updating any of these files, please be
        sure to update all of them.
        Please notify the following of any committed patches:
                binutils@sourceware.org
                gdb-patches@sourceware.org

For one, the `brought in via a merge' part seems to suggest that changes
might be cherry-picked from upstream, while all the last updates to
those files just took the upstream versions as-is.

And while the gcc docs explicitly mention that updating those files is a
free-for-all and needs no approval, I'm not fully certain if the same
holds for binutils-gdb.  The last part (`notify the following') seems to
suggest so, but maybe make this explicit if so.

Thanks.
        Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University