removed obsolete extension check, as it caused problems on some OSes

Renderer.cc

@@ -98,11 +98,6 @@ QString Renderer::checkOpenGL()
 
   QString missing("");
 
-#ifndef __APPLE__
-  if ( !ACG::checkExtensionSupported("GL_vertex_program") )
-    missing += "GL_vertex_program extension missing\n";
-#endif
-
   return missing;
 }