Fix build when run on pre-macOS Monterey #65
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When run on macOS versions before Monterey (12.0), the
kAudioObjectPropertyElementMainconstant does not exist, resulting in a failed build. This is equivalent to the deprecatedkAudioObjectPropertyElementMasterconstant, which does work. This PR adds a#ifndefto use the old constant pre-Monterey which fixes builds on older macOS versions (e.g. Catalina and Big Sur).