scalapack adds bad paths on MacOS

[lindsayad]

Bug Description

scalapack cmake config from conda brings build paths and runtime libraries not relevant on MacOS like libgcc_s and some others

Steps to Reproduce

Try to build MFEM which queries the scalapack cmake info

Impact

Can't build MFEM on MacOS when using the scalapack coming from our PETSc conda build

[Optional] Diagnostics

No response