Fixed: Ensure mono compatible facades are present at build

src/Libraries/Mono/readme.txt

@@ -0,0 +1,3 @@
+Copied from mono/4.5/Facades of the mono 5.4 release.
+These are the mono version of the dotnet Core TypeForwardedTo assemblies.
+Using these assemblies is no longer necessary once we reach mono 5.18 as minimum version

src/MonoFacades.targets

@@ -7,36 +7,45 @@
     Warning: We ONLY support facades that reside directly in MonoFacadesPath, otherwise the joining of items becomes complicated.
 
     Any MonoFacade listed that doesn't exist on disk will be removed instead of replaced.
+
+    See: https://github.com/mono/mono/blob/master/tools/nuget-hash-extractor/download.sh
+    That list defines assemblies that are prohibited from being loaded from the appdir, instead loading from mono GAC.
   -->
 
   <PropertyGroup>
     <MonoFacadesPath>$(MSBuildThisFileDirectory)Libraries\Mono\</MonoFacadesPath>
+    <ResolveReferencesDependsOn>
+      $(ResolveReferencesDependsOn);
+      SubstituteMonoFacadesBuild
+    </ResolveReferencesDependsOn>
   </PropertyGroup>
 
   <ItemGroup>
     <MonoFacade Include="$(MonoFacadesPath)*.dll" />
+    <MonoFacade Include="System.IO.Compression.dll" />
+    <MonoFacade Include="System.Net.Http.dll" />
+
+    <!-- List of MonoFacade by FileName -->
+    <MonoFacade_Facade Include="@(MonoFacade->'%(Filename)%(Extension)')" />
   </ItemGroup>
 
-  <Target Name="SubstituteMonoFacades"
-          AfterTargets="ComputeFilesToPublish"
-          BeforeTargets="CopyFilesToPublishDirectory">
-    
-    <ItemGroup>
-      <!-- List of MonoFacade by FileName -->
-      <MonoFacade_Facade Include="@(MonoFacade->'%(Filename)%(Extension)')" />
+  <Target Name="SubstituteMonoFacadesBuild"
+          AfterTargets="ResolveAssemblyReferences"
+          BeforeTargets="GenerateBindingRedirects">
 
-      <!-- List of ResolvedFileToPublish by FileName and filter out those without Facades -->
-      <MonoFacade_Resolved Include="@(ResolvedFileToPublish->'%(Filename)%(Extension)')">
-        <OriginalIdentity>%(ResolvedFileToPublish.Identity)</OriginalIdentity>
+    <ItemGroup>
+      <!-- List of ReferenceCopyLocalPaths by FileName and filter out those without Facades -->
+      <MonoFacade_Resolved Include="@(ReferenceCopyLocalPaths->'%(Filename)%(Extension)')">
+        <OriginalIdentity>%(ReferenceCopyLocalPaths.Identity)</OriginalIdentity>
         <MonoFacadeIdentity>$(MonoFacadesPath)%(Filename)%(Extension)</MonoFacadeIdentity>
       </MonoFacade_Resolved>
       <MonoFacade_Unrelated Include="@(MonoFacade_Resolved)" />
       <MonoFacade_Unrelated Remove="@(MonoFacade_Facade)" />
       <MonoFacade_Resolved Remove="@(MonoFacade_Unrelated)" />
 
-      <!-- Modify the actual Publish list -->
-      <ResolvedFileToPublish Remove="@(MonoFacade_Resolved->'%(OriginalIdentity)')" />
-      <ResolvedFileToPublish Include="@(MonoFacade_Resolved->'%(MonoFacadeIdentity)')" Condition="Exists('%(MonoFacade_Resolved.MonoFacadeIdentity)')" />
+      <!-- Modify the actual copy list -->
+      <ReferenceCopyLocalPaths Remove="@(MonoFacade_Resolved->'%(OriginalIdentity)')" />
+      <ReferenceCopyLocalPaths Include="@(MonoFacade_Resolved->'%(MonoFacadeIdentity)')" Condition="Exists('%(MonoFacade_Resolved.MonoFacadeIdentity)')" />
     </ItemGroup>
   </Target>