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

# scope1.m
function scope1 (n)
  value = n;
  if value
    C;
  end
  function A
    B;
    function B
      scope1 (0);
    endfunction
  endfunction

  function C
    D;
    function D
      A;
    endfunction
  endfunction
endfunction