updating misc/tvguide: detect installed browser

[Matt Peterson]

I'm in the process of upgrading the misc/tvguide port.  It's Perl script to 
grab tv listings from tvguide.com and output them in HTML, TXT, etc..  It 
can spawn wget, curl, lynx, or LWP::UserAgent.

Is it possible in the port Makefile to run a case statement to detect if 
any of the above browsers are already registered/installed; if not, fall 
back to a patch to use fetch?  Pointing me to a port that already does 
something similar to this would be awesome.  Thx.

--
Matt Peterson         another.geek.without.a.life
matt at peterson.org       http://matt.peterson.org/
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