bin:* dependencies and searched directories

[Vincent Lefevre]

I got the following bug report:

  https://trac.macports.org/ticket/30922

The problem is that some directories in $PATH, like /usr/texbin, are
not searched by MacPorts. Shouldn't this be a change in base?

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Vincent Lefèvre <vincent at vinc17.net> - Web: <http://www.vinc17.net/>
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