add SourceLink support (#545)

Jint/Directory.Build.props

@@ -11,10 +11,18 @@
     <PackageTags>javascript, interpreter</PackageTags>
     <PackageProjectUrl>https://github.com/sebastienros/jint</PackageProjectUrl>
     <PackageLicenseUrl>https://raw.githubusercontent.com/sebastienros/jint/master/LICENSE.txt</PackageLicenseUrl>
-    <RepositoryType>git</RepositoryType>
-    <RepositoryUrl>git://github.com/sebastienros/jint</RepositoryUrl>
+
+    <!-- SourceLink support -->
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <EmbedUntrackedSources>true</EmbedUntrackedSources>
+    <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
+
   </PropertyGroup>
 
+  <ItemGroup Condition="'$(SourceLinkEnabled)' != 'false'">
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-63127-02" PrivateAssets="All"/>
+  </ItemGroup>
+
   <!-- Called after so that the <VersionSuffix> is built after the local ones -->
   <Import Project="../Common.props"/>