Apply Bash 4.4.20 to fix cpu spinning on built-in wait

[Robie Basak]

Hi Wiebe,

On Mon, May 20, 2019 at 04:17:11PM +0200, Wiebe Cazemier wrote:
> https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1822776

Thank you for taking the time to report this bug and helping to make
Ubuntu better, and for bringing attention to the bug here.

I responded in the bug. I hope that helps.

Robie
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