- use alternatives to switch _bindir/emacs between emacs and emacs-nox
        (Henning Schmiedehausen, #151067)
    - remove emacs and emacs-nox from bindir
    - prereq alternatives for emacs and emacs-nox
    - add post and postun scripts to handle alternatives
    - buildrequire xorg-x11-devel instead of XFree86-devel
    - really include and apply emacs-21.3-latex-mode-hook-144083.patch
    - make emacs and emacs-nox own _datadir/emacs/version too