ANN: MPI.jl v0.10.0: new build process and CUDA-aware support

@kose-y and @simonbyrne, a big thanks for making CUDA-aware MPI available to the Julia community! Unfortunately, when I tried CUDA-aware MPI with MPI.jl on two different systems, it failed in both cases. Could you have a look at this post where I reported the errors? It would be fantastic if I got it to work before the AGU conference this weekend… :slight_smile: