If `packagelispdir' and `packagedatadir' are not set then AUCTeX expects
tex-site.el to be in a directory above the actual auctex dir and sets
the variables `TeX-data-directory' and `TeX-lisp-directory' to incorrect
values. This will prevent such things as correct loading of the styles/
directory.
Signed-off-by: Rüdiger Sonderfeld <ruediger@c-plusplus.de>