Avoid calling glutInit() on Mac platforms since this causes an error saying that glut is being initialized twice

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@334 fdac6126-5c0c-442c-9429-916003d36597

src/OpenMesh/Apps/Decimating/decimaterviewer.cc

@@ -70,7 +70,9 @@ int main(int argc, char **argv)
   QApplication::setColorSpec( QApplication::CustomColor );
   QApplication app(argc,argv);
   
+#if !defined(__APPLE__)
   glutInit(&argc,argv);
+#endif
 
   if ( !QGLFormat::hasOpenGL() ) {
     QString msg = "System has no OpenGL support!";