regression ? gnuplot graphics_toolkit on windows

[Tatsuro MATSUOKA]

On octave 5.0.91 on windows

octave:9> graphics_toolkit gnuplot
octave:10> plot ([0 1])
octave:11> print("test.eps","-deps")
error: __gnuplot_drawnow__: the gnuplot terminal, "postscript", is not available
error: called from
    __gnuplot_drawnow__ at line 50 column 9
    __gnuplot_print__>local_drawnow at line 232 column 5
    __gnuplot_print__>eps_drawnow at line 220 column 5
    __gnuplot_print__ at line 68 column 9
    print at line 692 column 14

On 4.4.1, this works without problem.
I think that this is a regression and release stopper.

Tatsuro