Remove unused reference assemblies

Ix.NET/Source/refs/System.Interactive.Async.Providers.Ref/System.Interactive.Async.Providers.Ref.csproj

@@ -1,19 +0,0 @@
-<Project Sdk="MSBuild.Sdk.Extras">
-
-  <PropertyGroup>
-    <Description>Interactive Extensions Async Providers Library used to build query providers and express queries over enumerable sequences.</Description>
-    <AssemblyTitle>Interactive Extensions - Async Providers Library</AssemblyTitle>
-    <TargetFrameworks>netcoreapp2.0;netstandard2.1</TargetFrameworks>
-    <PackageTags>Ix;Interactive;Extensions;Enumerable;Asynchronous</PackageTags>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <Compile Include="..\..\System.Interactive.Async.Providers\**\*.cs" Exclude="..\..\System.Interactive.Async.Providers\obj\**" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\System.Interactive.Async.Ref\System.Interactive.Async.Ref.csproj" />
-    <ProjectReference Include="..\System.Linq.Async.Queryable.Ref\System.Linq.Async.Queryable.Ref.csproj" />
-  </ItemGroup>
-
-</Project>

Ix.NET/Source/refs/System.Interactive.Async.Ref/System.Interactive.Async.Ref.csproj

@@ -1,23 +0,0 @@
-<Project Sdk="MSBuild.Sdk.Extras">
-
-  <PropertyGroup>
-    <Description>Interactive Extensions Async Library used to express queries over asynchronous enumerable sequences.</Description>
-    <AssemblyTitle>Interactive Extensions - Async Library</AssemblyTitle>
-    <Authors>Microsoft</Authors>
-    <TargetFrameworks>netcoreapp2.0;netstandard2.1</TargetFrameworks>
-    <PackageTags>Ix;Interactive;Extensions;Enumerable;Asynchronous</PackageTags>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <Compile Include="..\..\System.Interactive.Async\**\*.cs" Exclude="..\..\System.Interactive.Async\obj\**" />
-    <Compile Include="..\..\System.Linq.Async\System\Error.cs" Link="System\Error.cs" />
-    <Compile Include="..\..\System.Linq.Async\System\Linq\AsyncIterator.cs" Link="System\Linq\AsyncIterator.cs" />
-    <Compile Include="..\..\System.Linq.Async\System\Linq\Set.cs" Link="System\Linq\Set.cs" />
-    <Compile Include="..\..\System.Linq.Async\System\Strings.cs" Link="System\Strings.cs" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\System.Linq.Async.Ref\System.Linq.Async.Ref.csproj" />
-  </ItemGroup>
-  
-</Project>

Ix.NET/Source/refs/System.Linq.Async.Queryable.Ref/System.Linq.Async.Queryable.Ref.csproj

@@ -1,23 +0,0 @@
-<Project Sdk="MSBuild.Sdk.Extras">
-
-  <PropertyGroup>
-    <Description>LINQ Standard Query Operators used to express queries over asynchronous enumerable sequences.</Description>
-    <AssemblyTitle>System.Linq.Async.Queryable</AssemblyTitle>
-    <Authors>Microsoft</Authors>
-    <TargetFrameworks>netstandard1.0;netcoreapp2.0;netstandard2.1</TargetFrameworks>
-    <PackageTags>Enumerable;Asynchronous;LINQ</PackageTags>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.1" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\System.Linq.Async.Ref\System.Linq.Async.Ref.csproj" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <Compile Include="..\..\System.Linq.Async.Queryable\**\*.cs" Exclude="..\..\System.Linq.Async.Queryable\obj\**" />
-  </ItemGroup>
-  
-</Project>