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(Vx_pixel_size_width_font_regexp): New variable.
(x_set_font): Handle fontset.
(Fx_create_frame): Create fontsets in Vglobal_fontset_alist.
(Fx_list_fonts): Handle fontset.
(syms_of_xfns): Initialize Vx_pixel_size_width_font_regexp.
Setting callback functions for fontset handler.