fixed build error on OS X by removing unused functionality.
fixed build error on OS X by removing unused functionality.

Vertexwahn/appleseed,appleseedhq/appleseed,Biart95/appleseed,Vertexwahn/appleseed,luisbarrancos/appleseed,appleseedhq/appleseed,glebmish/appleseed,aytekaman/appleseed,dictoon/appleseed,aytekaman/appleseed,Biart95/appleseed,appleseedhq/appleseed,docwhite/appleseed,gospodnetic/appleseed,est77/appleseed,aiivashchenko/appleseed,est77/appleseed,docwhite/appleseed,aiivashchenko/appleseed,aytekaman/appleseed,dictoon/appleseed,gospodnetic/appleseed,pjessesco/appleseed,gospodnetic/appleseed,aiivashchenko/appleseed,est77/appleseed,aiivashchenko/appleseed,dictoon/appleseed,pjessesco/appleseed,gospodnetic/appleseed,pjessesco/appleseed,appleseedhq/appleseed,est77/appleseed,luisbarrancos/appleseed,Aakash1312/appleseed,luisbarrancos/appleseed,gospodnetic/appleseed,pjessesco/appleseed,glebmish/appleseed,Aakash1312/appleseed,docwhite/appleseed,est77/appleseed,dictoon/appleseed,aiivashchenko/appleseed,Biart95/appleseed,Aakash1312/appleseed,Vertexwahn/appleseed,luisbarrancos/appleseed,aytekaman/appleseed,Vertexwahn/appleseed,docwhite/appleseed,pjessesco/appleseed,luisbarrancos/appleseed,glebmish/appleseed,glebmish/appleseed,docwhite/appleseed,Vertexwahn/appleseed,aytekaman/appleseed,Biart95/appleseed,dictoon/appleseed,appleseedhq/appleseed,Biart95/appleseed,Aakash1312/appleseed,Aakash1312/appleseed,glebmish/appleseed