Revert "support for Hypre BigInt with AmgX solver"
Revert "support for Hypre BigInt with AmgX solver"

This reverts commit 1f5420f3cfe3e77b1e3c903cce743fa9cc4e1f96.

mfem/mfem,mfem/mfem,mfem/mfem,mfem/mfem,mfem/mfem