* mu-cite.el: (char-category): Force redefine as a function because it may

* mu-cite.el: (char-category): Force redefine as a function because it may
 have been defined by emu.el;
 don't use `int-char' for XEmacs if the function `char-category-list' returns
 a list of characters;
 enclose the whole form with `eval-and-compile'.

* MU-CFG: Define the function `add-to-list' for a makeshift.

* MU-MK: Define byte-optimizer for replacing `sref' with `aref';
 silence XEmacs not to say "bound but not referenced".
(byte-compile-file-form-custom-declare-variable): Define it for old Emacsen.

* mu-cite.el: Undo the last change.