* 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 5d7fa863de.
* remove redudant return statement
82df0e549d