bug#32836: emacs-magit is broken (and probably others) due to package renaming

[Björn Höfling]

Commit

5c8031ff7382ec9079040d08ae5a05b4dd2352b7

mass-renamed emacs-packages from "foo" to "emacs-foo". Unfortunately,
some package definitions use the package-name for building the URL.
That is for example the case in emacs-magit:

(define-public emacs-magit
  (package
    (name "emacs-magit")
    (version "2.13.0")
    (source (origin
             (method url-fetch)
             (uri (string-append
                   "https://github.com/magit/magit/releases/download/";
                   version "/" name "-" version ".tar.gz"))

Thus, it can no longer be built:

Starting download of 
/gnu/store/h01ag9sr8nxiqbnlblmxplnv43a2005j-emacs-magit-2.13.0.tar.gz
From 
https://github.com/magit/magit/releases/download/2.13.0/emacs-magit-2.13.0.tar.gz...
ERROR: download failed 
"https://github.com/magit/magit/releases/download/2.13.0/emacs-magit-2.13.0.tar.gz";
 404 "Not Found"

Pierre, could you have a look into it?

Thanks

Björn

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