Disable packaging for DllImportGenerator for now (#65795)

* Disable packaging for DllImportGenerator for now

For reasoning see #65495 (comment).

Author: ViktorHofer

src/libraries/System.Runtime.InteropServices/gen/Directory.Build.props

@@ -1,13 +1,12 @@
-<Project>
+<Project>
   <Import Project="..\Directory.Build.props" />
   <PropertyGroup>
     <IsShipping>false</IsShipping>
-    <IsPackable>false</IsPackable>
     <!-- We manually enable DllImportGenerator for projects in this folder as part of testing. -->
     <EnableDllImportGenerator>false</EnableDllImportGenerator>
     <EnableDefaultItems>true</EnableDefaultItems>
     <CLSCompliant>false</CLSCompliant>
     <ILLinkTrimAssembly>false</ILLinkTrimAssembly>
     <IsGeneratorProject>true</IsGeneratorProject>
   </PropertyGroup>
-</Project>
+</Project>

src/libraries/System.Runtime.InteropServices/gen/DllImportGenerator/DllImportGenerator.csproj

@@ -11,7 +11,8 @@
     <RunAnalyzers>true</RunAnalyzers>
 
     <!-- Packaging properties -->
-    <IsPackable>true</IsPackable>
+    <!-- In the future DllImportGenerator might ship as part of a package, but meanwhile disable packaging. -->
+    <IsPackable>false</IsPackable>
     <IncludeBuildOutput>false</IncludeBuildOutput>
     <SuppressDependenciesWhenPacking>true</SuppressDependenciesWhenPacking>
     <PackageProjectUrl>https://github.com/dotnet/runtime/tree/main/src/libraries/System.Runtime.InteropServices/gen/DllImportGenerator</PackageProjectUrl>