compiler wrapper: prioritize spack store paths in -L, -I, -rpath (#43593)

* compiler wrapper: prioritize spack managed paths in search order

This commit partitions search paths of -L, -I (and -rpath) into three
groups, from highest priority to lowest:

1. Spack managed directories: these include absolute paths such as
   stores and the stage dir, as well as all relative paths since they
   are relative to a Spack owned dir
2. Non-system dirs: these are for externals that live in non-system
   locations
3. System dirs: your typical `/usr/lib` etc.

It's very easy for Spack to known the prefixes it owns, it's much more
difficult to tell system dirs from non-system dirs. Before this commit
Spack tried to distinguish only system and non-system dirs, and failed
for very trivial cases like `/usr/lib/x/..` which comes up often, since
build systems sometimes copy search paths from `gcc -print-search-dirs`.

Potentially this implementation is even faster than the current state of
things, since a loop over paths is replaced with an eval'ed `case ...`.

* Trigger a pipeline

* Revert "Trigger a pipeline"

This reverts commit 5d7fa863de91c5557ef4432c0ea105ed0924a6e8.

* remove redudant return statement

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