Apple mobile: System.Diagnostics.Process.dll has P/Invoke to SystemNative_IsATty which doesn't exist

[rolfbjarne]

The System.Diagnostics.Process.dll as a P/Invoke to SystemNative_IsATty, but that method is not provided by libSystem.Native.dylib (or the .a variant).

$ monodis dotnet-sdk-11.0.100-preview.3.26179.101/packs/Microsoft.NETCore.App.Runtime.Mono.maccatalyst-arm64/11.0.0-preview.3.26179.101/runtimes/maccatalyst-arm64/lib/net11.0/System.Diagnostics.Process.dll | grep -i SystemNative_IsATty

    // method line 57
    .method assembly static hidebysig pinvokeimpl ("libSystem.Native" as "SystemNative_IsATty" winapi nomangle )
           default int32 '<IsATty>g____PInvoke|64_0' (native int __fd_native)  cil managed preservesig
    {

$ nm dotnet-sdk-11.0.100-preview.3.26179.101/packs/Microsoft.NETCore.App.Runtime.Mono.maccatalyst-arm64/11.0.0-preview.3.26179.101/runtimes/maccatalyst-arm64/native/libSystem.Native.dylib|grep SystemNative_IsATty
[no output]

This happens for iOS, Mac Catalyst and tvOS.

It started happening in this maestro bump: dotnet/macios#25013

A quick look reveals a317e0f CC @adamsitnik

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[matouskozak]

We've seen it in the perf lab as well https://dev.azure.com/dnceng/internal/_build/results?buildId=2938632&view=logs&j=c7d5dc60-c0be-5c95-7757-513ebaf8d5e3&t=cb4abf8a-d4d4-51be-627a-c87525fde72c

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