gtags.el. work with links.

[Ivan Romanov]

Hello. In emacs 23.1 gtags.el don't work with links. 
I have my source code in '/data/dev/parabola'. 
cd /data/dev
ln -s parabola link-parabola
cd link-parabola
emacs main.cpp
In buffer issue command 'gtags-find-tag-by-event' on any function and
get message 'global: '/data/dev/link-parabola/Function.cpp' is out of
source tree.'. 

I fix it. See below.

diff gtags.el /usr/share/gtags/gtags.el
362c362
<               nil nil t (file-name-nondirectory buffer-file-name)))
---
>               nil nil t (file-name-nondirectory (file-truename
buffer-file-name))))
382c382
<   (call-process "gozilla"  nil nil nil (concat "+" (number-to-string
(gtags-current-lineno))) buffer-file-name))
---
>   (call-process "gozilla"  nil nil nil (concat "+" (number-to-string
(gtags-current-lineno))) (file-truename buffer-file-name)))
477c477
<         (setq context (concat "--from-here=" (number-to-string
(gtags-current-lineno)) ":" buffer-file-name))
---
>         (setq context (concat "--from-here=" (number-to-string
(gtags-current-lineno)) ":" (file-truename buffer-file-name)))

With regards. Taurus.