Fix text shaping of precomposed characters with HarfBuzz
* src/hbfont.c (hbfont_shape): Fix setting TO of lglyph for the case when Lisp shape-gstring function performed some compositions by itself. This happens with hebrew.el. See https://lists.freedesktop.org/archives/harfbuzz/2019-June/007396.html for the details of the problem this solves.
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