Synch with latest snapshot of Oort Gnus (the CVS server is currently down).

Synch with latest snapshot of Oort Gnus (the CVS server is currently down).

* mm-view.el: Require `gnus-mailcap' rather than `mailcap'.

* nnheader.el (mm-with-unibyte-buffer): Bind `default-mc-flag' instead of
 `mc-flag'.
(nnheader-with-unibyte-current-buffer): New macro.
(mm-with-unibyte-current-buffer): Alias to
 `nnheader-with-unibyte-current-buffer'.
(nnheader-guess-mime-charset): New macro.
(mm-guess-mime-charset): Alias to `nnheader-guess-mime-charset'.
(shell-command-to-string): New function for old Emacsen.

* lpath.el: Don't fbind `shell-command-to-string'.