Don't call purecopy in international/*.el

Don't call purecopy in international/*.el

* lisp/international/fontset.el (font-encoding-alist,)
(x-pixel-size-width-font-regexp, vertical-centering-font-regexp)
(face-font-rescale-alist, standard-fontset-spec):
* lisp/international/latexenc.el (latex-inputenc-coding-alist):
* lisp/international/mule-cmds.el (help-xref-mule-regexp-template)
(set-language-info-internal, set-language-info-alist)
(register-input-method, locale-language-names)
(locale-charset-language-names, locale-preferred-coding-systems)
(define-char-code-property):
* lisp/international/mule-conf.el (file-coding-system-alist):
* lisp/international/mule-diag.el (sort-listed-character-sets):
* lisp/international/mule.el (define-charset, load-with-code-conversion)
(put-charset-property, define-coding-system)
(ctext-non-standard-encodings-alist)
(ctext-non-standard-encodings-regexp, auto-coding-alist)
(auto-coding-regexp-alist):
* lisp/international/quail.el (quail-keyboard-layout-button):
(quail-keyboard-customize-button): Remove calls to purecopy.

(cherry picked from commit 833037fadd3533a50eb07406f058ee695c72fb9a)