Change CFRunLoopIsWaiting to return cf::Boolean #319
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According to this [doc], it's undefined behavior for a `bool` to be any value other than `0` or `1`. Since `Boolean` is ultimately an `unsigned char`, this avoids the risk that this function could return a `true` value that's non-zero but not `1`. [doc]: https://doc.rust-lang.org/reference/behavior-considered-undefined.html
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According to this doc, it's undefined behavior for a
boolto be anyvalue other than
0or1. SinceBooleanis ultimately anunsigned char, this avoids the risk that this function could return atruevalue that's non-zero but not1.