Function harfbuzz_sys::hb_font_funcs_set_user_data

pub unsafe extern fn hb_font_funcs_set_user_data(ffuncs: *mut hb_font_funcs_t, key: *mut hb_user_data_key_t, data: *mut c_void, destroy: hb_destroy_func_t, replace: hb_bool_t) -> hb_bool_t