[lltx] Removed support of dfont format in luaotfload

[Philipp Gesang]

Hi Bruno.

···<date: 2016-05-14, Saturday>···<from: Bruno Voisin>···

> With version 2.7, luaotfload has removed support of dfont
> format. This is mentioned in NEWS
> 
> 2016/04/21, luaotfload v2.7:
>     [...]
>     * Remove support for builtin Fontforge libraries (this includes the PFA,
>       PFB, DFONT, and feature file readers).
> 
> but no explanation is given for why this was removed. Is this
> given somewhere?

The fontloader has moved away from the Fontforge libraries that
ship with Luatex. The remaining parts were reimplemented entirely
on the Lua side. The support for Feature files and DFONT were
provided by the latter and will most likely not come back.

> On OS X the usage of dfont format is rapidly receding and
> apparently replaced by TTC, but still present for core OS and
> legacy fonts:

Personally, I’ve never encountered a DFONT in my life. They were
*never* tested at all and mostly worked by accident.

Best,
Philipp

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