bug#54914: 28.1.50; Unable to form Brahmi conjuncts in Emacs

[Eli Zaretskii]

> From: Sameer Singh <lumarzeli30@gmail.com>
> Date: Wed, 13 Apr 2022 16:25:41 +0530
> 
> Brahmi just like any other Indic script also has the ability to form 
> conjuncts, but despite using "Segoe UI
> Historic" font which supports Brahmi Conjuncts, Emacs is not able to display 
> them.

This is a missing feature: we don't have composition rules for the
Brahmi script, and more generally don't have any support for that
script.  Patches to add that are welcome.