System.Runtime.WindowsRuntime contains assembly refs to Windows platform WinMD types which are not available on Unix and required to crossgen the assembly.
mscorlib.dll
+System.Runtime.WindowsRuntime.dll
System.Runtime.WindowsRuntime.UI.Xaml.dll
System.Private.CoreLib.dll
xunit.performance.api.dll
+System.Runtime.WindowsRuntime.dll
System.Runtime.WindowsRuntime.UI.Xaml.dll
Microsoft.CodeAnalysis.VisualBasic.dll
System.Net.NameResolution.dll
mscorlib.dll
+System.Runtime.WindowsRuntime.dll
System.Runtime.WindowsRuntime.UI.Xaml.dll
System.Private.CoreLib.dll
xunit.performance.api.dll
mscorlib.dll
+System.Runtime.WindowsRuntime.dll
System.Runtime.WindowsRuntime.UI.Xaml.dll
System.Private.CoreLib.dll
xunit.performance.api.dll