GLES2: ignore GL_OES_vertex_array_object on emscripten
GLES2: ignore GL_OES_vertex_array_object on emscripten

seemingly disabled on purpose by default due to performance caveats
OGRECave/ogre,OGRECave/ogre,paroj/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,paroj/ogre,OGRECave/ogre