Rework dependency and target snippets to utilize depcomp.
This uses depcomp instead of multiple compiler passes to implement dependency tracking. It is only enabled for building objects; we do not use depcomp to link final binaries or shared objects. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@5148 18c085ea-50e0-402c-830e-de6fd14e8384
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