gEDA-dev: PCB DBus support code - 3

[Peter Clifton]

This patch adds lrealpath from libiberty to the PCB codebase.

I've not considered if/where it should be documented / credited yet
(apart from in the original files obviously).

I've update Makefile.am, and have set it to build always (it will be
unused if you don't have dbus configured in though).

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)
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