Fix gcc 4.8.5 warnings in Glass BSDF
Fix gcc 4.8.5 warnings in Glass BSDF

Vertexwahn/appleseed,pjessesco/appleseed,est77/appleseed,est77/appleseed,dictoon/appleseed,est77/appleseed,dictoon/appleseed,Vertexwahn/appleseed,luisbarrancos/appleseed,dictoon/appleseed,appleseedhq/appleseed,pjessesco/appleseed,Vertexwahn/appleseed,appleseedhq/appleseed,dictoon/appleseed,appleseedhq/appleseed,Vertexwahn/appleseed,pjessesco/appleseed,dictoon/appleseed,luisbarrancos/appleseed,luisbarrancos/appleseed,pjessesco/appleseed,appleseedhq/appleseed,Vertexwahn/appleseed,luisbarrancos/appleseed,est77/appleseed,est77/appleseed,luisbarrancos/appleseed,appleseedhq/appleseed,pjessesco/appleseed