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- this is specifically for the benefit of GNI provider; Mercury master depends
  on provider functionality that isn't in a tagged libfabric release yet
- this change should really be conditional on platform.  Querying spack
  developers for help on how to do this.

gcc-4.8.5 was not new enough to support thallium's use of 'std::decay_t'

-Werror proves annoying when building across various compilers.

there is a new version.  Also, NDCTL, while useful, brings in a lot of
dependencies.

- loading this as a runtime dep causes problems on cross-compiled environments
- maybe find a workaround if it turns out we really need this somewhere?

Remove tabs and replace with spaces.

- this reduces the number of modules that have to be loaded at run time
  to run mochi services