qt: for some reason STL support is turned off on OS X
qt: for some reason STL support is turned off on OS X

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