add copy of utf8.def as utf8x.def.ltxml

[dginev]

As discussed in #983 , adding a copy of the utf8.def binding for utf8x.def.

I tried the example from stackexchange (https://tex.stackexchange.com/a/184628/78008) and it seemed to look correct:

example source:

\documentclass[welsh]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8x]{inputenc}
\usepackage{babel}
\begin{document}

 Ââ Êê Îî Ôô Ŵŵ Ŷŷ Ïï

\end{document}

[brucemiller]

Looks fine, except for the manifest :>

[dginev]

I'm really starting to wish the MANIFEST auto-updated on commit :>

[dginev]

Done!