cmd/guru: remove Emacs support, now at github.com/dominikh/go-mode.el

Change-Id: I4350331b4f047b7388c274157ecbd49a582cf091
Reviewed-on: https://go-review.googlesource.com/30991
Reviewed-by: Dominik Honnef <dominik@honnef.co>
Reviewed-by: Robert Griesemer <gri@golang.org>
2 files changed