[jdk20] RFR: 8298527: Cygwin's uname -m returns different string than before [v5]

[Christoph Langer]

On Tue, 13 Dec 2022 21:38:18 GMT, Christoph Langer <clanger at openjdk.org> wrote:

>> `uname -m` returns `.x86_64` after the latest upgread, instead of `x86_64`. Not sure why.
>> 
>> However, we can handle this in autoconf-config.guess, to unbreak the build.
>
> Christoph Langer has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review suggestions

Thanks for the review & hints.

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PR: https://git.openjdk.org/jdk20/pull/15