patch of changing libdir in gtags.conf for exuberant-ctags and pygments-parser

[jmp]

Hi, thanks for your wonderful tool.

I find that, specifying the --libdir option, does not influence the
path of exuberant-ctags and pygments-parser, defined in the default
gtags.conf file.

Then, when we may not be able to use ctags or pygment parser, if using
the default gtags.conf shipped with the source code package.

I have created a patch, please take a look.

Basically, I have updated the gtags.conf.in template, and the
configuration script, such that it is able to follow user's --libdir
configuration when generating the gtags.conf file.

Thanks!

Youjie

libdir.patch
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