Modifications to work with dh_elpa.

Modifications to work with dh_elpa.

Forwarded: not-needed
Last-Update: 2021-01-01

* Strip down setupEmacs() function.  We only set f12 as a global key
  to start Macaulay2 inside Emacs.  This also strips (load "M2-init")
  from a user's existing .emacs-Macaulay2 file, which would cause
  errors if they haven't installed elpa-macaulay2.  We also warn the
  user if elpa-macaulay2 isn't installed.
* Set the correct installation directory for the Emacs files in the
  configure script.

Gbp-Pq: Name use-dh-elpa.patch