Make mh-* XEmacs compat aliases obsolete

Make mh-* XEmacs compat aliases obsolete

* lisp/mh-e/mh-acros.el (mh-make-local-hook): Make XEmacs and Emacs 20
macro obsolete.  Update all callers
* lisp/mh-e/mh-compat.el (mh-require): Make XEmacs compat alias
obsolete.  Update all callers
(mh-write-file-functions): Make XEmacs compat macro obsolete.  Update
all callers
(mh-assoc-string, mh-display-color-cells, mh-face-foreground)
(mh-face-foreground, mh-face-background)
(mh-font-lock-add-keywords, mh-image-load-path-for-library)
(mh-image-search-load-path, mh-line-beginning-position)
(mh-line-end-position, mh-mail-abbrev-make-syntax-table)
(mh-define-obsolete-variable-alias, mh-make-obsolete-variable)
(mh-match-string-no-properties, mh-replace-regexp-in-string)
(mh-test-completion, mh-url-hexify-string, mh-view-mode-enter)
(mh-window-full-height-p): Make XEmacs compat definitions into
obsolete function aliases for the same names but without the "mh-"
prefix.  Update all callers.