Delete stale references to System.IO.FileSystem.Primitives (#55041)

Author: stephentoub

src/libraries/System.IO.Compression.ZipFile/src/System.IO.Compression.ZipFile.csproj

@@ -17,7 +17,6 @@
   <ItemGroup>
     <Reference Include="System.IO.Compression" />
     <Reference Include="System.IO.FileSystem" />
-    <Reference Include="System.IO.FileSystem.Primitives" />
     <Reference Include="System.Runtime" />
     <Reference Include="System.Runtime.Extensions" />
   </ItemGroup>

src/libraries/System.IO.FileSystem/ref/System.IO.FileSystem.csproj

@@ -9,7 +9,6 @@
   <ItemGroup>
     <ProjectReference Include="..\..\System.Runtime\ref\System.Runtime.csproj" />
     <ProjectReference Include="..\..\System.Runtime.Extensions\ref\System.Runtime.Extensions.csproj" />
-    <ProjectReference Include="..\..\System.IO.FileSystem.Primitives\ref\System.IO.FileSystem.Primitives.csproj" />
     <ProjectReference Include="..\..\System.Text.Encoding\ref\System.Text.Encoding.csproj" />
   </ItemGroup>
 </Project>

src/libraries/System.Net.Sockets/ref/System.Net.Sockets.csproj

@@ -7,7 +7,6 @@
     <Compile Include="System.Net.Sockets.cs" />
   </ItemGroup>
   <ItemGroup>
-    <ProjectReference Include="..\..\System.IO.FileSystem.Primitives\ref\System.IO.FileSystem.Primitives.csproj" />
     <ProjectReference Include="..\..\System.Net.Primitives\ref\System.Net.Primitives.csproj" />
     <ProjectReference Include="..\..\System.Runtime\ref\System.Runtime.csproj" />
   </ItemGroup>