Fix CAMD/COLAMD/CCOLAMD/CXSparse include search directories

[Kyle Guinn]

Hi,

I maintain a Slackware build script for octave as found here:
http://slackbuilds.org/slackbuilds/14.0/academic/octave/octave.SlackBuild

Since around version 3.4.0 or maybe 3.2.4 or earlier, I noticed that
octave could no longer find some parts of SuiteSparse that I had
installed.  I've finally gotten around to finding the changeset that
broke it.  Patch is attached.

-Kyle

searchdirs.patch
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