RFR: 8247872: Upgrade HarfBuzz to the latest 2.7.2 [v2]

[Phil Race]

On Mon, 2 Nov 2020 12:33:17 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> I'm just a bit curious about the added, empty, `src/java.desktop/share/native/libharfbuzz/abc.txt`...
> 
> If it really is in upstream source, I'm not saying you should remove it. It just looks very odd. It's not a merge artifact?
> 
> (I could not even add review comments to an empty file in github! 😮)

oops. that should not have been in that folder. It was me practicing a different white space removal script.
I thought I checked for any extraneous files. I'll get rid of it now.

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PR: https://git.openjdk.java.net/jdk/pull/993