Remove script wrappers in v6.0.x

[jsquyres]

Hey @hppritcha is there a reason that we still need to keep carrying the script wrappers to v6.0.x and beyond?

They are not installed by default, but periodically someone does try and sometimes they do cause work (e.g., https://github.com/open-mpi/ompi/issues/12609). Does DOE still use the script wrappers for cross-compilation, or other reasons?

[minrk]

FWIW, we are exploring the script wrappers for cross compilation in Conda-forge, which prompted #12609. This is motivated largely by the fact that cross compilation for mpich has been far simpler for us because mpich compiler wrappers are scripts instead of binaries. We do have cross compilation working with openmpi, so we will probably skip migrating to the script wrappers if they are going to go away anyway.

[jsquyres]

@minrk Ok, great. Please keep us informed; we can keep the script wrappers (especially if they're working ok) -- my main motivation in filing this issue was that we probably haven't tested these scripts in years. If they're still working fine, that's good!

[hppritcha]

pinged some folks about this.