Fix osx-x64 cross compilation

[smoogipoo]

I'm not entirely sure about the change to CMakeLists - running into a clang++ error: unsupported option -mcx16 for target arm64-apple-darwin25.3.0. Just referencing surrounding code which relates to the host.

While I'm PRing this to main (i.e. .NET 11), I've tested compilation on .NET 10 (our target SDK) here: https://github.com/ppy/Satori/actions/runs/27126600038 If this is accepted I can either backport to each of the branches as required or wait for you to do it.

Compile args: ./build.sh clr -c Release --cross -a x64

[smoogipoo]

While it builds (and runs a simple hello world), it looks like there's something more to this because it segfaults at startup on our full-fledged app. Will try to debug further.

[smoogipoo]

I'm a bit lost on how to debug this further for the moment, it looks like it dies in JITted code and only in release builds of Satori - debug works fine. LLDB is also currently crashing when loading SOS >_<

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Reproduction steps:

1. Clone https://github.com/smoogipoo/osu-framework/tree/net10.0
2. Build osu.Framework.Tests (dotnet publish --self-contained -r osx-x64 osu.Framework.Tests/osu.Framework.Tests.csproj)
3. Replace output libs with Satori ones (10.0-based + this patch to fix compile).
4. Run osu.Framework.Tests (./osu.Framework.Tests/bin/Release/net10.0/osx-x64/publish/osu.Framework.Tests).

[hez2010]

I'm a bit lost on how to debug this further for the moment, it looks like it dies in JITted code and only in release builds of Satori - debug works fine. LLDB is also currently crashing when loading SOS >_<

Reproduction steps:

1. Clone https://github.com/smoogipoo/osu-framework/tree/net10.0
2. Build osu.Framework.Tests (dotnet publish --self-contained -r osx-x64 osu.Framework.Tests/osu.Framework.Tests.csproj)
3. Replace output libs with Satori ones (10.0-based + this patch to fix compile).
4. Run osu.Framework.Tests (./osu.Framework.Tests/bin/Release/net10.0/osx-x64/publish/osu.Framework.Tests).

Some discussion happened in discord that might be related:

just recently realized it didn't spill all registers it should have inside the WB