bug#13158: 24.3.50; elisp source link in *Help* for variable is missing

[Sam Steingold]

In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.4.2)
 of 2012-12-10 on t520sds
Bzr revision: 111172 eliz@gnu.org-20121210141219-l9js8plqhi0txzw1
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:     Ubuntu 12.04.1 LTS

C-h v gud-key-prefix RET
creates a *Help* buffer without the clickable link to the elisp source
location of the variable definition

-- 
Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000
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