- Use any installed version of [x]emacs
- If there's no emacs at all, fall back to xemacs21-mule
- files/patch-isa_isabelle-system.el: Avoid interactive prompt if building
with GNU emacs.
Submitted by: barner, maintainer (partly)
Approved by: Timothy Bourke <timbob@bigpond.com> (maintainer)
Reported by: kris via pointyhat
