Don't expose TrustedCertificatesDirectory() and StartNewTlsSessionContext() to NetFx (#113963)

Author: steveharter

src/libraries/System.DirectoryServices.Protocols/ref/System.DirectoryServices.Protocols.cs

@@ -382,8 +382,10 @@ public partial class LdapSessionOptions
         internal LdapSessionOptions() { }
         public bool AutoReconnect { get { throw null; } set { } }
         public string DomainName { get { throw null; } set { } }
+#if NET
         [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("windows")]
         public string TrustedCertificatesDirectory { get { throw null; } set { } }
+#endif
         public string HostName { get { throw null; } set { } }
         public bool HostReachable { get { throw null; } }
         public System.DirectoryServices.Protocols.LocatorFlags LocatorFlag { get { throw null; } set { } }
@@ -404,8 +406,10 @@ internal LdapSessionOptions() { }
         public bool Signing { get { throw null; } set { } }
         public System.DirectoryServices.Protocols.SecurityPackageContextConnectionInformation SslInformation { get { throw null; } }
         public int SspiFlag { get { throw null; } set { } }
+#if NET
         [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("windows")]
         public void StartNewTlsSessionContext() { }
+#endif
         public bool TcpKeepAlive { get { throw null; } set { } }
         public System.DirectoryServices.Protocols.VerifyServerCertificateCallback VerifyServerCertificate { get { throw null; } set { } }
         public void FastConcurrentBind() { }