Add [email protected] % [email protected] ^[email protected] to exp/0.17…

….3/cpu/b

This deployment is in support of recent user requests for VASP v6.4.x
compiled with Wannier90 integration [1]. Please note, however, to
satisfy the requests, we have utlized an updated Spack package from
@jerrypgreenberg for VASP v6.4.x, which has significant changes to its
build process and GPU support --- e.g., moving from CUDA to OpenACC. As
such, the Spack package in the sdsc package repo has been update as
well, but will not be backwards-compatible with earlier versions of
VASP.

[1] #51