Breaking change in default imports when core compiler is used from netfx builds

Core compiler is [now used by default](https://github.com/dotnet/roslyn/pull/77914) even in netfx builds. That results in a breaking change in behavior due to this:

https://github.com/dotnet/roslyn/blob/7cf639061c4a7fa8e713e88bbd289a945938c3d8/src/Compilers/Shared/BuildClient.cs#L86-L94

Workaround: set msbuild property `RoslynCompilerType=FrameworkPackage`.

	/// <summary>
	/// Returns the directory that contains mscorlib, or null when running on CoreCLR.
	/// </summary>
	public static string? GetSystemSdkDirectory()
	{
	return RuntimeHostInfo.IsCoreClrRuntime
	? null
	: RuntimeEnvironment.GetRuntimeDirectory();
	}

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Breaking change in default imports when core compiler is used from netfx builds #79907

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Breaking change in default imports when core compiler is used from netfx builds #79907

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