Function harfbuzz_sys::hb_unicode_compose

pub unsafe extern "C" fn hb_unicode_compose(
    ufuncs: *mut hb_unicode_funcs_t, 
    a: hb_codepoint_t, 
    b: hb_codepoint_t, 
    ab: *mut hb_codepoint_t
) -> hb_bool_t