Remove DiaSymReader prebuilt in source-build (dotnet/core-setup#7319)

Commit migrated from https://github.com/dotnet/core-setup/commit/22326dadefcc7115c0edbd41450dca65b8d163f8

src/installer/pkg/packaging-tools/framework.dependency.targets

@@ -168,9 +168,14 @@
     <ItemGroup>
       <CrossgenToolPackageReference Include="Microsoft.Private.CoreFx.NETCoreApp" Version="$(MicrosoftPrivateCoreFxNETCoreAppPackageVersion)" />
       <CrossgenToolPackageReference Include="transport.Microsoft.NETCore.Runtime.CoreCLR" Version="$(MicrosoftNETCoreRuntimeCoreCLRPackageVersion)" />
-      <CrossgenToolPackageReference Include="Microsoft.DiaSymReader.Native" Version="$(MicrosoftDiaSymReaderNativePackageVersion)" />
       <CrossgenToolPackageReference Include="$(MicrosoftTargetingPackPrivateWinRTPackage)" Version="$(MicrosoftTargetingPackPrivateWinRTPackageVersion)" />
 
+      <!-- This tool is a prebuilt not buildable from source. -->
+      <CrossgenToolPackageReference
+        Condition="'$(DotNetBuildFromSource)' != 'true'"
+        Include="Microsoft.DiaSymReader.Native"
+        Version="$(MicrosoftDiaSymReaderNativePackageVersion)" />
+
       <!--
         If any tool packages are missing, add them with ExcludeAssets=All. Be careful not to modify
         existing PackageReferences.
@@ -251,6 +256,14 @@
       <_diaSymReaderToolDir>%(_diaSymReaderAssembly.RootDir)%(_diaSymReaderAssembly.Directory)</_diaSymReaderToolDir>
     </PropertyGroup>
 
+    <!--
+      DiaSymReader can't be built from source, so use an unrelated default directory in that case.
+      This is used as the working directory for crossgen calls.
+    -->
+    <PropertyGroup Condition="'$(DotNetBuildFromSource)' == 'true'">
+      <_diaSymReaderToolDir>$(IntermediateOutputPath)</_diaSymReaderToolDir>
+    </PropertyGroup>
+
     <ItemGroup>
       <_requiredProperty Include="_coreLibDirectory;_crossGenPath;_jitPath;_fxLibDirectory;_windowsWinMDDirectory;_diaSymReaderToolDir" />
     </ItemGroup>

src/installer/pkg/projects/netcoreapp/src/netcoreapp.depproj

@@ -7,12 +7,16 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Private.CoreFx.NETCoreApp" Version="$(MicrosoftPrivateCoreFxNETCoreAppPackageVersion)" />
     <PackageReference Include="transport.Microsoft.NETCore.Runtime.CoreCLR" Version="$(MicrosoftNETCoreRuntimeCoreCLRPackageVersion)" />
-    <PackageReference Include="Microsoft.DiaSymReader.Native" Version="$(MicrosoftDiaSymReaderNativePackageVersion)" />
     <PackageReference Include="Microsoft.NETCore.Platforms" Version="$(MicrosoftNETCorePlatformsPackageVersion)" />
     <PackageReference Include="Microsoft.NETCore.Targets" Version="$(MicrosoftNETCoreTargetsPackageVersion)" />
     <PackageReference Include="NETStandard.Library" Version="$(NETStandardLibraryPackageVersion)" />
   </ItemGroup>
 
+  <!-- This tool is a prebuilt not buildable from source. -->
+  <ItemGroup Condition="'$(DotNetBuildFromSource)' != 'true'">
+    <PackageReference Include="Microsoft.DiaSymReader.Native" Version="$(MicrosoftDiaSymReaderNativePackageVersion)" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(PackageTargetRuntime)' == ''">
     <!-- Bring in Platforms for RID graph, NETStandard.Library for build-tools,
          Targets for an empty runtime.json to reduce conflicts from 1.x packages -->