cray-mpich: fix, it was not using spack compiler wrappers #57
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In the migration to spack 1.0 with #30 we inadvertently switch from using spack compiler wrappers (with all their support for correctly setting build flags) to using the "plain" regular compiler.
This ended up with build problems (see spack/spack-packages#1193) because not using the spack compiler wrapper means not using
SPACK_STORE_*variables that contains information about include/libs of all dependencies. This was more damaging for some build systems than others, but it might be that this triggered also subtle problems (possibly #51?).