Remove XEmacs compat code from ps-print

Remove XEmacs compat code from ps-print

* lisp/ps-print.el:
(ps-print-color-p, ps-postscript-code-directory, ps-setup):
* lisp/ps-def.el:
(ps-mark-active-p, ps-face-foreground-name)
(ps-face-background-name, ps-color-device, ps-color-values)
(ps-face-bold-p, ps-face-italic-p, ps-face-strikeout-p)
(ps-face-overline-p, ps-face-box-p)
(ps-generate-postscript-with-faces1): Remove XEmacs compat code
and some outdated Emacs compat code.