render_mesh: tell matplotlib not to load GTK

Status Job ID Name Coverage
  External
passed cdash

passed ghostflow-branch-check-master

passed ghostflow-commit-check

failed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus

passed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus+vtk

failed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus

failed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus

failed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus

failed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus

failed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus

00:07:29

passed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus+vtk

passed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus+vtk

passed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus+vtk

passed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus+vtk

passed smtk@master-moho-linux-shared-relwithdebinfo+cgm+matplotlib+remus+vtk

00:06:56