[jdk20] RFR: 8298527: Cygwin's uname -m returns different string than before [v4]

[Christoph Langer]

On Mon, 12 Dec 2022 18:40:33 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> We certainly don't want spurious output, so that means we need to get creative.

OK, I have tried to be creative then. 😄  I refactored the script a bit. First, I collect stderr into a variable and then only print it if we didn't handle the platform ourselves in config.guess. I also made one block for all the cases where $OUT is empty.

I checked our ppc64le builds and they currently contain the autoconf-config.guess debug output although the build works. With this change, the ppc64le build log (and those of the other platforms handled in config.guess) should be a bit cleaner.

WDYT?

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