Apple go on making it harder and harder to support multiple
versions of their pathetic operating system in one code base.
kIOMainPortDefault is the "non-deprecated" replacement for
kIOMasterPortDefault. However, it is now marked as being available only
on macOS 12 and later so it refuses to build in a codebase designed to
run on earlier versions of macOS. Le bubbling sigh.
According to https://developer.apple.com/documentation/iokit/kiomasterportdefault?language=objc
passing NULL has the same effect and avoids the stupid warning.
Hopefully this will work till Apple decides to spend their trillion
dollars doing more stupid shit.
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