[tex-live] Missing fd files for stix

[Enrico Gregorio]

For some reasons, the .fd files necessary to run documents
having \usepackage{stix} are missing. They can be easily generated
by

  tex stix.fdd

See https://tex.stackexchange.com/questions/430749/problem-with-stix-fonts-in-texlive-2018
for a description of the problem.

The last revision for stix is http://tug.org/svn/texlive?view=revision&sortby=date&revision=47540

Ciao
Enrico