[11u] RFR 8257547: Handle multiple prereqs on the same line in deps files

[Roland Westrelin]

Hi Christoph,

> can you please add these two lines to your commit message please:
>
> 8257547: Handle multiple prereqs on the same line in deps files
> 8256810: Incremental rebuild broken on Macosx
>
> This will then take care that both backports get resolved (automatically).
>
> I've approved both backports.

Thanks. I will push it with the commit message you suggest.

Roland.