Fix more failures of visual-order cursor movement under word-wrap (bug#16961).
src/xdisp.c (move_it_in_display_line_to): If word-wrap is ON, and there's a valid wrap point in the display line, the last glyph cannot "just barely fit" on this row, because display_line doesn't let it. Instead, proceed as if the last glyph didn't fit, so that we eventually back up the iterator to the wrap point. This avoids delusional behavior of move_it_to, whereby it proceeds to the next display line, but sets current_x to zero for all the glyphs that without word-wrap would fit on the previous display line. One result was that visual-order cursor movement behaved erratically under word-wrap. (Fmove_point_visually): Add code to find the x coordinate of the last character before wrap point, under word-wrap on a TTY.
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