Added Microsoft.Win32.Registry to .NET Standard that is only referenced when using the dotnet SDK on Windows.

Author: paulmedynski

tools/specs/Microsoft.Data.SqlClient.nuspec

@@ -74,6 +74,7 @@ When using NuGet 3.x this package requires at least version 3.4.</description>
         <dependency id="Microsoft.IdentityModel.Protocols.OpenIdConnect" version="6.35.0" />
         <dependency id="Microsoft.IdentityModel.JsonWebTokens" version="6.35.0" />
         <dependency id="Microsoft.SqlServer.Server" version="1.0.0"/>
+        <dependency id="Microsoft.Win32.Registry" version="5.0.0" />
         <dependency id="System.Buffers" version="4.5.1" />
         <dependency id="System.Configuration.ConfigurationManager" version="6.0.1" exclude="Compile" />
         <dependency id="System.Runtime.Caching" version="6.0.0" exclude="Compile" />
@@ -96,6 +97,7 @@ When using NuGet 3.x this package requires at least version 3.4.</description>
         <dependency id="Microsoft.IdentityModel.Protocols.OpenIdConnect" version="6.35.0" />
         <dependency id="Microsoft.IdentityModel.JsonWebTokens" version="6.35.0" />
         <dependency id="Microsoft.SqlServer.Server" version="1.0.0"/>
+        <dependency id="Microsoft.Win32.Registry" version="5.0.0" />
         <dependency id="System.Configuration.ConfigurationManager" version="6.0.1" exclude="Compile" />
         <dependency id="System.Runtime.Caching" version="6.0.0" exclude="Compile" />
         <dependency id="System.Runtime.Loader" version="4.3.0" />