Add debugging to C# InstallLocations.cs to determine why the support path is wrong

Author: barrycaceres

Diff for: csharp/runner/SnippetRunner/InstallLocations.cs

@@ -222,7 +222,7 @@ private static bool IsDirectory(string path)
 
         Console.Error.WriteLine();
         Console.Error.WriteLine("---------------------------------");
-        Console.Error.WriteLine("PLATFORM ID: " + PlatformID.MacOSX);
+        Console.Error.WriteLine("PLATFORM ID: " + Environment.OSVersion.Platform);
         Console.Error.WriteLine("DEFAULT SUPPORT PATH: " + defaultSupportPath);
         Console.Error.WriteLine("HOME SUPPORT PATH: " + homeSupport.FullName);
         Console.Error.WriteLine("---------------------------------");