Remove Platform.SupportsReparsePoints query

src/System.Management.Automation/CoreCLR/CorePsPlatform.cs

@@ -217,12 +217,6 @@ namespace System.Management.Automation
 
         }
 
-        // non-windows does not have reparse points
-        internal static bool SupportsReparsePoints()
-        {
-            return IsWindows;
-        }
-
         // non-windows does not support removing drives
         internal static bool SupportsRemoveDrive()
         {

src/System.Management.Automation/namespaces/FileSystemProvider.cs

@@ -8589,14 +8589,11 @@ namespace Microsoft.PowerShell.Commands
 
         private static SafeFileHandle OpenReparsePoint(string reparsePoint, FileDesiredAccess accessMode)
         {
-            if (Platform.SupportsReparsePoints())
-            {
-                return WinOpenReparsePoint(reparsePoint,accessMode);
-            }
-            else
-            {
-                throw new PlatformNotSupportedException();
-            }
+#if LINUX
+            throw new PlatformNotSupportedException();
+#else
+            return WinOpenReparsePoint(reparsePoint,accessMode);
+#endif
         }
 
         private static SafeFileHandle WinOpenReparsePoint(string reparsePoint, FileDesiredAccess accessMode)