Prefer setq-local in emacs-lisp/*.el

Prefer setq-local in emacs-lisp/*.el

* lisp/emacs-lisp/chart.el (chart-mode):
* lisp/emacs-lisp/copyright.el (copyright-update):
* lisp/emacs-lisp/eieio-custom.el (eieio-customize-object):
* lisp/emacs-lisp/elint.el (elint-update-env, elint-init-form):
* lisp/emacs-lisp/ert.el (ert--results-update-ewoc-hf):
(ert--setup-results-buffer):
* lisp/emacs-lisp/lisp-mode.el (lisp-mode-variables):
* lisp/emacs-lisp/pp.el (pp-display-expression):
* lisp/emacs-lisp/re-builder.el (reb-mode, reb-restart-font-lock):
* lisp/emacs-lisp/shadow.el (load-path-shadows-mode):
* lisp/emacs-lisp/smie.el (smie-setup):
* lisp/emacs-lisp/syntax.el (syntax-propertize):
* lisp/emacs-lisp/trace.el (trace-make-advice): Prefer setq-local.