[rtems-tools] Fix shlex.join on python 3.8 and earlier

[Frank Kühndel]

Hello Chris,

if I did not make any mistake, this patch works fine on OpenSUSE 15.5.

I had some headaches because the source-builder tries to download the 
rtems-tools as tar.bz2 and the version with the patch is not yet on that 
server. I fumbled your patch into the cached tar.bz2. That seemed to 
work in the end.

Greetings
Frank

On 8/30/23 01:54, chrisj at rtems.org wrote:
> Hi Frabnk and Joel,
> 
> Can you please test this patch and let me know if the issue has been
> fixed?
> 
> Thanks
> Chris

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