(printing): Fix :version, printing.el was included

(printing): Fix :version, printing.el was included
for in emacs-22.1.
(pr-path-style, pr-path-alist, pr-txt-name)
(pr-txt-printer-alist, pr-ps-name, pr-ps-printer-alist)
(pr-temp-dir, pr-ps-temp-file, pr-file-modes, pr-gv-command)
(pr-gs-command, pr-gs-switches, pr-gs-device, pr-gs-resolution)
(pr-print-using-ghostscript, pr-file-tumble, pr-auto-region)
(pr-auto-mode, pr-mode-alist, pr-ps-utility)
(pr-ps-utility-alist, pr-menu-char-height, pr-menu-char-width)
(pr-setting-database, pr-visible-entry-list)
(pr-delete-temp-file, pr-list-directory, pr-buffer-name)
(pr-buffer-name-ignore, pr-buffer-verbose): Remove incorrect
:version.