guard against InheritFolderPermissionsNotImplementedException in linux.

NzbDrone.Common/DiskProvider.cs

@@ -271,10 +271,20 @@ namespace NzbDrone.Common
         {
             Ensure.That(() => filename).IsValidPath();
 
+            try
+            {
                 var fs = File.GetAccessControl(filename);
                 fs.SetAccessRuleProtection(false, false);
                 File.SetAccessControl(filename, fs);
             }
+            catch (NotImplementedException)
+            {
+                if (!OsInfo.IsLinux)
+                {
+                    throw;
+                }
+            }
+        }
 
         public long? GetAvailableSpace(string path)
         {