Prompted by PR: 13476, 13477 Submitted by: KATO Tsuguru
wemi-setupel.el file is installed into ${PREFIX}/${EMACS_LIBDIR_WITH_VER}/site-lisp.
to provide MIME feature for GNU Emacs(Mule) based on SEMI API. Namely it contains whole features of SEMI thus it is a replacement of SEMI. This is a development version. I forgot to put this in previous commit log.