[msbuild] Take the .NET version into account when computing the illin…

…k.dll location. (#15876)

We use illink.dll from the executing .NET version: if we're building with .NET
7, then we're using illink from .NET 7. This means we can't hard-code 'net6.0'
when computing the path to illink.dll for remote builds.

Fixes https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_workitems/edit/1611403.

msbuild/Xamarin.iOS.Tasks.Windows/Xamarin.iOS.Common.After.targets

@@ -312,8 +312,8 @@ Copyright (C) 2011-2013 Xamarin. All rights reserved.
 		Outputs="$(_LinkSemaphore)">
 
 		<PropertyGroup>
-			<!-- We need to use net5.0 because when building from VS it sets MSBuildRuntimeType to Core and will pick net472 (which doesn't contain the illink assembly) -->
-			<_RemoteILLinkPath>$(ILLinkTasksAssembly.Replace('$(NetCoreRoot)', '$(_DotNetRootRemoteDirectory)').Replace('net472', 'net6.0').Replace('$([System.IO.Path]::GetFileName('$(ILLinkTasksAssembly)'))', 'illink.dll'))</_RemoteILLinkPath>
+			<!-- We need to use netX.Y because when building from VS it sets MSBuildRuntimeType to Core and will pick net472 (which doesn't contain the illink assembly) -->
+			<_RemoteILLinkPath>$(ILLinkTasksAssembly.Replace('$(NetCoreRoot)', '$(_DotNetRootRemoteDirectory)').Replace('net472', 'net$(BundledNETCoreAppTargetFrameworkVersion)').Replace('$([System.IO.Path]::GetFileName('$(ILLinkTasksAssembly)'))', 'illink.dll'))</_RemoteILLinkPath>
 		</PropertyGroup>
 
 		<!-- Include Debug symbols as input so those are copied to the server -->