[ic] [interchange] Only apply GDBM filters if they are not already installed

[Mike Heins]

Quoting David Christensen (david at endpoint.com):
> 
> On Aug 31, 2012, at 5:33 AM, Stefan Hornburg (Racke) wrote:
> 
> > What about using DBM_Filter?
> > 
> > https://metacpan.org/module/DBM_Filter
> > 
> > That seems to have an easier interface and comes with Perl.
> > 
> > Regards
> >        Racke
> 
> I believe that's already the interface it's using; see `perldoc perldbmfilter`.
> 
> As far as Mike's concern, we could just do one check to see if it's
> already installed. I'll re-review the docs and revise the patch.

Thanks, David. I'm a strong believer in trying to cut overhead
wherever possible. It's small, but over thousands of requests it
can be appreciable.

-- 
Mike Heins
Perusion -- Expert Interchange Consulting    http://www.perusion.com/
phone +1.765.253.4194  <mike at perusion.com>

My wife is great.  She doesn't care where I go, just as long as I don't
have any fun.  -- Lee Trevino