hydra_pmi_proxy encounters libcudart.so linker error on Ubuntu22 about mpich HOT 2 OPEN

@BKitor another workaround you can try is to build Hydra standalone without the CUDA dependency:

cd src/pm/hydra
./configure --prefix=<path/to/install> --without-cuda
make -j
make install

from mpich.

Thanks for the report! Hydra is getting the CUDA dependency from the embedded convenience library (MPL) that contains our GPU wrappers used in MPICH. Since none of that GPU code is actually used in Hydra, another solution might be to link Hydra with an MPL without any GPU dependencies. That or we move to dlopen/dlsym for GPU support in MPL, which shouldn't get triggered by the Hydra processes.

from mpich.