Bump macOS Xcode baseline to 11?

[Tor Lillqvist]

>
>
> (For iOS, our baseline is documented as Xcode 9.3, too.  I have no
> opinion whether or not we would want to bump that as well.
>

Oh, definitely yes. IMHO we shouldn't even mention any specific version but
just tell people who want to build for iOS to use the latest Xcode.

--tml
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