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don't load ft_* funcs if freetype2 binding not available

username-removed-495550 requested to merge anthrotype/harfpy:without-freetype into master

FreeType is recommended, but is not required to build and use HarfBuzz.

It would be nice if harfpy could be used with a harfbuzz library that was built --with-freetype=no. Currently, if one tries to do that, one gets a Symbol not found error from cytpes.

I think that checking if the freetype2 bindings are importable or not is a good marker as to whether one is interested or not in exposing the freetype-related symbols in the harfbuzz library.

There are also other places in harfbuzz.py where you check if freetype != None:. (note that None is a singleton, so one should use is or is not instead of == or !=)

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