Log Message:
If the Emacs flavour is "xemacs", don't pull in the www/w3 support, pull in
"xemacs-packages" instead.  Also, make sure that the Lisp installation
directory is correct for all flavours.

Patch from PR39287 from Anthony Mallet, with minor modification to pull in
"xemacs-packages" as a replacement for "www/w3".