[tex-live] more testing

[Akira Kakuto]

From: karl at freefriends.org (Karl Berry)

>     now everything that does not use fmtutil has to be adapted
> 
> What in TeX Live does not use fmtutil?  I was under the impression this
> was the only way formats got created.

fmtutil assumes a unique format name, while some ConTeXt users
want to use the same format name with the other engine.
Therefore Olaf introduced $engine when he unified the
format suffix (.fmt).
Thomas decided not to support the $engine mechanism in
fmtutil because most people may not need the mechanism,
and because it is a bit complicated.

Best regards
Akira