[release/8.0] Wrong architecture libc++ bundled with wasm cross-compilers on linux-arm64

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Description

x64 libc++ is getting bundled. Investigating why.

Reproduction Steps

Expected behavior

Actual behavior

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

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OK, this is specifically an issue for Wasm, the linux-arm64->android-* has the correct arch libc++

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Not specific to release/8.0, bad in main

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The combination of https://github.com/dotnet/runtime/blame/main/src/mono/mono.proj#L258 and https://github.com/dotnet/runtime/blame/main/src/mono/mono.proj#L991 is clearly always wrong for WASM, and whoever wrote these conditionals is an idiot.

Working on a fix ASAP.