Update SystemUUID.swift

[fmatuszewski]

Fix For older Maxos platforms.
#available(macOS 12, *) is not available on runtime for older platforms it must be replaced by Compiletime directive #if MACOS12_OR_LATER

Description

I have an older laptop and I can't compile this code because if #available(macOS 12, *) { this function is not available on older mac platforms. Ater I replaced it with compile time directive it start to works.

[github-actions]

Hey there and thank you for opening this pull request! 👋🏼

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Details:

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[miquelbeltran]

Hello. I am not sure this change is correct, you are changing a runtime OS version check by a compilation flag.

As I understand, if you compile the code on an older machine and deploy it to a modern machine, it will break because it will use kIOMasterPortDefault when it should be using kIOMainPortDefault. And the same the other way around.

[vbuberen]

I would appreciate if you check the provided PR template and fill in info as well as read contributors guide and name the PR properly. Respect other people's time.

[miquelbeltran]

Closing since no follow up