Stop producing runtime-site-extension-internal.zip (#248)

This .zip isn't used anymore.

build/PackSiteExtension.targets

@@ -1,43 +0,0 @@
-<Project>
-  <PropertyGroup>
-    <PackageDependsOn>$(PackageDependsOn);PackSiteExtensionFiles</PackageDependsOn>
-    <MSBuildProjectFiles>$(MSBuildProjectFiles);$(MSBuildThisFileFullPath)</MSBuildProjectFiles>
-
-    <SiteExtensionOobArchive>$(BuildDir)runtime-site-extension-internal-$(PackageVersion).zip</SiteExtensionOobArchive>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <ArtifactInfo Include="$(SiteExtensionOobArchive)">
-      <ArtifactType>ZipArchive</ArtifactType>
-      <RepositoryRoot>$(RepositoryRoot)</RepositoryRoot>
-      <Category>shipoob</Category>
-    </ArtifactInfo>
-  </ItemGroup>
-
-  <Target Name="PackSiteExtensionFiles"
-    DependsOnTargets="Compile;_CollectSiteExtensionFiles"
-    Inputs="@(SiteExtensionFile);$(MSBuildProjectFiles)"
-    Outputs="$(SiteExtensionOobArchive)">
-
-    <ZipArchive
-      SourceFiles="@(SiteExtensionFile)"
-      WorkingDirectory="$(SiteExtBasePath)"
-      File="$(SiteExtensionOobArchive)"
-      Overwrite="True" />
-
-  </Target>
-
-  <Target Name="_CollectSiteExtensionFiles">
-    <PropertyGroup>
-      <SiteExtBasePath>$(RepositoryRoot)extensions\Microsoft.AspNetCore.Runtime.SiteExtension\</SiteExtBasePath>
-    </PropertyGroup>
-    <ItemGroup>
-      <SiteExtensionFile Include="$(RepositoryRoot)src\Microsoft.Web.Xdt.Extensions\bin\$(Configuration)\net461\Microsoft.Web.Xdt.Extensions.dll"
-        Link="content/Microsoft.Web.Xdt.Extensions.dll" />
-      <SiteExtensionFile Include="$(SiteExtBasePath)install.cmd"
-        Link="content/install.cmd" />
-      <SiteExtensionFile Include="$(SiteExtBasePath)applicationHost.xdt"
-        Link="content/applicationHost.xdt" />
-    </ItemGroup>
-  </Target>
-</Project>

build/repo.targets

@@ -1,5 +1,4 @@
 <Project>
-  <Import Project="PackSiteExtension.targets" />
 
   <PropertyGroup>
       <ComposeSdk Condition="$(SITE_EXTENSION_SDK_VERSION) == ''">True</ComposeSdk>