* mfem: specify PETSC_DIR, link correct sundials libraries * fix: only use PETSC_DIR directly for static builds * fix: only use sundials nvecmpiplusx for MFEM 4.2+
* mfem: specify PETSC_DIR, link correct sundials libraries * fix: only use PETSC_DIR directly for static builds * fix: only use sundials nvecmpiplusx for MFEM 4.2+