downgrade MSBuild to 16.8

Author: oleksandr-didyk

eng/SourceBuildPrebuiltBaseline.xml

@@ -3,24 +3,4 @@
   <IgnorePatterns>
     <UsagePattern IdentityGlob="Microsoft.SourceBuild.Intermediate.*" />
   </IgnorePatterns>
-  <!-- Following packages are required for MSBuild and MSBuild.Tasks.Core dependencies -->
-  <!-- Packages must be pinned to the exact version (i.e. up to patch number) coming from MSBuild -->
-  <Usages>
-    <Usage Id="Microsoft.Win32.SystemEvents" Version="6.0.0" />
-    <Usage Id="System.CodeDom" Version="6.0.0" />
-    <Usage Id="System.Configuration.ConfigurationManager" Version="6.0.0" />
-    <Usage Id="System.Drawing.Common" Version="6.0.0" />
-    <Usage Id="System.Formats.Asn1" Version="6.0.0" />
-    <Usage Id="System.Reflection.MetadataLoadContext" Version="6.0.0" />
-    <Usage Id="System.Resources.Extensions" Version="6.0.0" />
-    <Usage Id="System.Security.Cryptography.Pkcs" Version="6.0.1" />
-    <Usage Id="System.Security.Cryptography.ProtectedData" Version="6.0.0" />
-    <Usage Id="System.Security.Cryptography.Xml" Version="6.0.1" />
-    <Usage Id="System.Security.Permissions" Version="6.0.0" />
-    <Usage Id="System.Text.Encoding.CodePages" Version="6.0.0" />
-    <Usage Id="System.Text.Encodings.Web" Version="6.0.0" />
-    <Usage Id="System.Text.Json" Version="6.0.0" />
-    <Usage Id="System.Threading.Tasks.Dataflow" Version="6.0.0" />
-    <Usage Id="System.Windows.Extensions" Version="6.0.0" />
-  </Usages>
 </UsageData>

eng/Version.Details.xml

@@ -6,12 +6,12 @@
       <Sha>a6f84d42529494b3539684ed993fa554281215b7</Sha>
       <SourceBuild RepoName="runtime" ManagedOnly="false" />
     </Dependency>
-    <Dependency Name="Microsoft.Build" Version="17.5.0-preview-22620-02">
+    <!-- MSBuild versions starting from 16.10.0 do not target NET Core -->
+    <Dependency Name="Microsoft.Build" Version="16.8.0">
       <Uri>https://github.com/dotnet/msbuild</Uri>
       <Sha>a6f6699d1f70bf79db82030938d2c5e52d1e4d2e</Sha>
-      <SourceBuild RepoName="msbuild" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.Build.Tasks.Core" Version="17.5.0-preview-22620-02">
+    <Dependency Name="Microsoft.Build.Tasks.Core" Version="16.8.0">
       <Uri>https://github.com/dotnet/msbuild</Uri>
       <Sha>a6f6699d1f70bf79db82030938d2c5e52d1e4d2e</Sha>
     </Dependency>

eng/Versions.props

@@ -10,8 +10,8 @@
     <UsingToolNetFrameworkReferenceAssemblies>true</UsingToolNetFrameworkReferenceAssemblies>
     <UsingToolSymbolUploader>true</UsingToolSymbolUploader>
     <!-- latest versions -->
-    <MicrosoftBuildVersion>17.5.0-preview-22620-02</MicrosoftBuildVersion>
-    <MicrosoftBuildTasksCoreVersion>17.5.0-preview-22620-02</MicrosoftBuildTasksCoreVersion>
+    <MicrosoftBuildVersion>16.8.0</MicrosoftBuildVersion>
+    <MicrosoftBuildTasksCoreVersion>16.8.0</MicrosoftBuildTasksCoreVersion>
     <MicrosoftSourceLinkGitHubVersion>1.2.0-beta-22518-02</MicrosoftSourceLinkGitHubVersion>
     <MicrosoftDotNetXliffTasksVersion>1.0.0-beta.22627.1</MicrosoftDotNetXliffTasksVersion>
     <SystemTextJsonVersion>8.0.0-alpha.1.22631.1</SystemTextJsonVersion>