(x_draw_hollow_cursor, x_draw_bar_cursor)

(x_draw_hollow_cursor, x_draw_bar_cursor)
(x_draw_phys_cursor_glyph): Set phys_cursor_width here.
(x_display_and_set_cursor): Don't set phys_cursor_width here for
bar cursors only, to make phys_cursor_width contain what its name
suggests.
(notice_overwritten_cursor): Consider the cursor image erased if
the output area intersects the cursor image in y-direction.