Fix compilation with PETSc and not hypre.
Fix compilation with PETSc and not hypre.

JaeryunYim/dealii,shakirbsm/dealii,shakirbsm/dealii,EGP-CIG-REU/dealii,naliboff/dealii,shakirbsm/dealii,EGP-CIG-REU/dealii,angelrca/dealii,jperryhouts/dealii,EGP-CIG-REU/dealii,angelrca/dealii,pesser/dealii,danshapero/dealii,JaeryunYim/dealii,angelrca/dealii,pesser/dealii,shakirbsm/dealii,kalj/dealii,spco/dealii,danshapero/dealii,sairajat/dealii,sairajat/dealii,jperryhouts/dealii,jperryhouts/dealii,naliboff/dealii,EGP-CIG-REU/dealii,shakirbsm/dealii,sairajat/dealii,JaeryunYim/dealii,jperryhouts/dealii,naliboff/dealii,spco/dealii,sairajat/dealii,kalj/dealii,jperryhouts/dealii,naliboff/dealii,EGP-CIG-REU/dealii,pesser/dealii,pesser/dealii,JaeryunYim/dealii,angelrca/dealii,EGP-CIG-REU/dealii,kalj/dealii,pesser/dealii,kalj/dealii,angelrca/dealii,spco/dealii,naliboff/dealii,JaeryunYim/dealii,sairajat/dealii,jperryhouts/dealii,JaeryunYim/dealii,danshapero/dealii,naliboff/dealii,danshapero/dealii,pesser/dealii,spco/dealii,shakirbsm/dealii,angelrca/dealii,jperryhouts/dealii,kalj/dealii,spco/dealii,kalj/dealii,danshapero/dealii,danshapero/dealii,angelrca/dealii,sairajat/dealii,pesser/dealii,JaeryunYim/dealii,sairajat/dealii,naliboff/dealii,kalj/dealii,shakirbsm/dealii,spco/dealii,spco/dealii,danshapero/dealii,EGP-CIG-REU/dealii