Catalina 10.15.1 add AMD Navi RDNA support

Apple today seeded the first beta of an upcoming macOS Catalina 10.15.1 update to developers.

Support has been added for the AMD Navi RDNA architecture.

https://developer.apple.com/documentation/macos_release_notes/macos_catalina_10_15_1_beta_release_notes

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Good news to RX 5700/XT and RX 5500.