[Orgmode] fix in org-publish-update-timestamp

[Richard KLINDA]

I use the ~ character to denote my home directory in
org-publish-project-alist (:base-directory and :publishing-directory),
like:

,----
| (setq org-publish-project-alist
|       (list
|        '("foo" . (:base-directory "~/doc/foo/" ...
`----

When directories are given this way and ORG-PUBLISH-UPDATE-TIMESTAMP
uses the touch command to update the timestamp, it doesn't work because
Emacs should expand the ~/ into the home directory via EXPAND-FILE-NAME.

See the attached patch, Carsten please include this, thanks.

diff --git a/lisp/org-publish.el b/lisp/org-publish.el
index c6c7421..399fdd3 100644
--- a/lisp/org-publish.el
+++ b/lisp/org-publish.el
@@ -233,7 +233,7 @@ If there is no timestamp, create one."
     (if (and (fboundp 'set-file-times)
             (not newly-created-timestamp))
        (set-file-times timestamp-file)
-      (call-process "touch" nil 0 nil timestamp-file))))
+      (call-process "touch" nil 0 nil (expand-file-name timestamp-file)))))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;; Mapping files to project names

-- 
Richard