- 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