[cmake-developers] Refactoring search path construction

[Chuck Atkins]

I've just pushed a branch to the stage for review:
refactor-search-path-construction , not merged to next due to the current
release hold.

Just a head's up, it's rather invasive.  It's a re-factoring of how search
paths get constructed for find* commands.  Up until now, search paths have
been incrementally constructed with the composite search path being the
only result.  This separates and constructs each "class" of search path
separately and combines them together afterwards.

This branch is a pre-cursor for new features that can manipulate groups of
search paths with leaving others untouched.

- Chuck
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