Expanding texlive-iftex to include all sty files

[LaFreniere, Joseph]

The current texlive-iftex recipe only includes iftex.sty, despite 
the upstream https://ctan.org/pkg/iftex also including 
if{e,lua,v,xe}tex.sty files.  Is there a way to expand the recipe 
to include those additional files?

I think this should be accomplished just by including the files' 
paths in the third argument to `simple-texlive-package' in the 
recipe's definition, but the recipe's version would also need to 
be bumped and I don't see any examples of how to do so for TeX 
recipes.

--
Joseph LaFreniere