Fix misuses of `make-local-variable` on hooks

Fix misuses of `make-local-variable` on hooks

* lisp/vc/smerge-mode.el (smerge-ediff):
* lisp/progmodes/python.el (python-pdbtrack-setup-tracking):
* lisp/net/tramp-smb.el (tramp-smb-call-winexe):
* lisp/net/secrets.el (secrets-mode):
* lisp/mail/rmail.el (rmail-variables):
* lisp/ielm.el (inferior-emacs-lisp-mode):
* lisp/erc/erc-log.el (erc-log-setup-logging): Use `add-hook`.

* lisp/eshell/em-unix.el (eshell/diff):
* lisp/eshell/em-hist.el (eshell-hist-initialize): Don't
`make-local-variable` on hooks.