[tlbuild] Harfbuzz 4.4.x

[Andreas Scherer]

> According to the build logs for TeX Live on Github, now a slightly 
> different error scenario shows up. I'll try to investigate later.
Fixed for now. All three build logs on Github are clean again.

AFAICS, the next version of Harfbuzz will fix this upstream:

https://github.com/harfbuzz/harfbuzz/commit/79eb0f74860fb6309e3162b4f17f98481c05a318
https://github.com/harfbuzz/harfbuzz/commit/3238cb744bb570a75326ab4438968c59069e9af2
https://github.com/harfbuzz/harfbuzz/commit/7b51bc95d9cf0d9a2e91a37319fa34e4e5f26927

Stay safe!
Andreas