Removing System.Security.Cryptography.ProtectedData.dll as a dependency in VSIX (#271)

Author: satbai

CredentialProvider.Microsoft.VSIX/Microsoft.CredentialProvider.swr

@@ -92,7 +92,6 @@ folder InstallDir:\Common7\IDE\CommonExtensions\Microsoft\NuGet\Plugins\Credenti
   file source=$(PluginBinPath)\System.Security.Cryptography.Csp.dll
   file source=$(PluginBinPath)\System.Security.Cryptography.Encoding.dll
   file source=$(PluginBinPath)\System.Security.Cryptography.Primitives.dll
-  file source=$(PluginBinPath)\System.Security.Cryptography.ProtectedData.dll
   file source=$(PluginBinPath)\System.Security.Cryptography.X509Certificates.dll
   file source=$(PluginBinPath)\System.Security.Principal.dll
   file source=$(PluginBinPath)\System.Security.SecureString.dll