Clean up PETSc Build script
Clean up PETSc Build script

Closes #13965

laagesen/moose,nuclear-wizard/moose,andrsd/moose,harterj/moose,jessecarterMOOSE/moose,permcody/moose,nuclear-wizard/moose,dschwen/moose,andrsd/moose,SudiptaBiswas/moose,harterj/moose,jessecarterMOOSE/moose,dschwen/moose,dschwen/moose,bwspenc/moose,jessecarterMOOSE/moose,harterj/moose,lindsayad/moose,bwspenc/moose,andrsd/moose,SudiptaBiswas/moose,sapitts/moose,dschwen/moose,andrsd/moose,nuclear-wizard/moose,laagesen/moose,bwspenc/moose,SudiptaBiswas/moose,permcody/moose,sapitts/moose,sapitts/moose,sapitts/moose,idaholab/moose,sapitts/moose,milljm/moose,lindsayad/moose,nuclear-wizard/moose,SudiptaBiswas/moose,milljm/moose,bwspenc/moose,milljm/moose,permcody/moose,idaholab/moose,permcody/moose,lindsayad/moose,laagesen/moose,harterj/moose,lindsayad/moose,laagesen/moose,idaholab/moose,idaholab/moose,harterj/moose,dschwen/moose,idaholab/moose,milljm/moose,SudiptaBiswas/moose,andrsd/moose,jessecarterMOOSE/moose,laagesen/moose,bwspenc/moose,lindsayad/moose,milljm/moose,jessecarterMOOSE/moose