Upstream stopped making standalone tarball releases after 13.3 and now
distributes AUCTeX only through GNU ELPA. They recommend packagers
install the ELPA package as-is.
Switch MASTER_SITES to elpa.gnu.org and replace the autotools build with
a plain install of the package tree under share/emacs/site-lisp/auctex.
Also generate the autoloads file at build time. Users no longer need
anything in their init file, because the site default.el loads the
autoloads, which in turn load tex-site.
The preview-latex style files are no longer installed into the texmf
tree. preview.el finds them in the package directory and adds it to
TEXINPUTS at run time, so the texhash step and the TeX build dependency
are gone. The info manuals and tex-ref.pdf are shipped prebuilt, so
gmake is no longer needed either.
Remove the pkg-message, whose instructions predate the current layout,
and refresh pkg-descr from upstream's README.
Changes: https://elpa.gnu.org/packages/doc/auctex.html#Changes
Approved by: hrs (maintainer)
Sponsored by: The FreeBSD Foundation