Remove analyzers and diasym during source-build

eng/targets/Settings.props

@@ -122,7 +122,7 @@
   <!--
     Analyzers
   -->
-  <ItemGroup>
+  <ItemGroup Condition="'$(DotNetBuildFromSource)' != 'true'">
     <PackageReference Include="Microsoft.CodeQuality.Analyzers" Version="$(MicrosoftCodeQualityAnalyzersVersion)" PrivateAssets="all" />
     <PackageReference Include="Microsoft.NetCore.Analyzers" Version="$(MicrosoftNetCoreAnalyzersVersion)" PrivateAssets="all" />
     <PackageReference Include="Roslyn.Diagnostics.Analyzers" Version="$(RoslynDiagnosticsAnalyzersVersion)" PrivateAssets="all" />

src/Compilers/Core/Portable/Microsoft.CodeAnalysis.csproj

@@ -19,7 +19,7 @@
       Do not install this package manually, it will be added as a prerequisite by other packages that require it.
     </PackageDescription>
   </PropertyGroup>
-  <ItemGroup>
+  <ItemGroup Condition="'$(DotNetBuildFromSource)' != 'true'">
     <Content Include="$(NuGetPackageRoot)\microsoft.diasymreader.native\$(MicrosoftDiaSymReaderNativeVersion)\runtimes\win\native\Microsoft.DiaSymReader.Native.x86.dll">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <Visible>false</Visible>
@@ -125,4 +125,4 @@
   <Import Project="..\AnalyzerDriver\AnalyzerDriver.projitems" Label="Shared" />
   <Import Project="..\..\..\Dependencies\CodeAnalysis.Debugging\Microsoft.CodeAnalysis.Debugging.projitems" Label="Shared" />
   <Import Project="..\..\..\Dependencies\PooledObjects\Microsoft.CodeAnalysis.PooledObjects.projitems" Label="Shared" />
-</Project>
\ No newline at end of file
+</Project>