This change is needed to make the reversion of a prior commit on thermofluids remain compatible with the rest of the code

Author: gateshian

FEBioFluid/FENewtonianThermoFluid.h

@@ -58,12 +58,12 @@ class FEBIOFLUID_API FENewtonianThermoFluid :	public FEThermoViscousFluid
     mat3ds Tangent_Temperature(FEMaterialPoint& mp) override;
 
     //! dynamic viscosity
-	double ShearViscosity(FEMaterialPoint& mp) override { return 0.0; }
-    double TangentShearViscosityTemperature(FEMaterialPoint& mp) { return 0.0; }
+    double ShearViscosity(FEMaterialPoint& mp) override;
+    double TangentShearViscosityTemperature(FEMaterialPoint& mp);
 
     //! bulk viscosity
-    double BulkViscosity(FEMaterialPoint& mp) override { return 0.0; }
-    double TangentBulkViscosityTemperature(FEMaterialPoint& mp) { return 0.0; }
+    double BulkViscosity(FEMaterialPoint& mp) override;
+    double TangentBulkViscosityTemperature(FEMaterialPoint& mp);
 
 public:
     double	m_kappa;	//!< bulk viscosity