Force configure not to find getentropy and clock_gettime
Force configure not to find getentropy and clock_gettime

cjh1/tomviz-superbuild,mathturtle/tomviz-superbuild,OpenChemistry/tomviz-superbuild,cjh1/tomviz-superbuild,OpenChemistry/tomviz-superbuild,mathturtle/tomviz-superbuild