[HarfBuzz] Use of bool and stdbool.h

[Ebrahim Byagowi]

Was looking inside libraqm code and saw the use of stdbool.h there, made we
wonder why HarfBuzz went for hb_bool_t and whether we can go for it also or
not.

If a migration isn't possible, most likely I'd guess, maybe having some
compiler definition for using actual bool instead 'int', at least for
clients that are embedding harfbuzz can trig some optimizations for them.

Thanks!
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