Log Message:
Update print/auctex to 11.92.

Three years' worth of changes are too much to list here - see the
file ChangeLog.1.

Add preview support, which excludes emacs2[01] for lack of graphics support.

Add *tex and ghostscript package dependency, providing a working setup
(the FreeBSD package does the same).

Tested with editors/{xemacs,emacs26}.