Fix regression in svg output and simplify viewport handling (bug #44765) * gl2ps-renderer.cc (glps-renderer::draw): remove check for GL2PS_NO_FEEDBACK, it it always true after EndViewport * gl2ps-renderer.h (glps-renderer::draw_axes): call gl2psBegin(End)Viewport for every axes and check for GL2PS_NO_FEEDBACK after each axes. * gl2ps-renderer.h (glps-renderer::draw_axes):remove unnecessary "naxes" attribute

# recursive_nest.m
function x = recursive_nest ()
  global recursive_nest_inc = 1
  x = 5;
  f (20);

  function f (n)
    if n > 0
      x = x + recursive_nest_inc;
      f (n - 1);
    end
  endfunction
endfunction