Remove duplicate references from ProjectCrackerExe

Author: rneatherway

src/fsharp/FSharp.Compiler.Service.ProjectCracker.Exe/FSharp.Compiler.Service.ProjectCracker.Exe.fsproj

@@ -78,17 +78,13 @@
     <Reference Include="FSharp.Core, Version=$(TargetFSharpCoreVersion), Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
       <Private>False</Private>
     </Reference>
-    <Reference Include="Microsoft.Build" />
-    <Reference Include="Microsoft.Build.Engine" />
-    <Reference Include="Microsoft.Build.Framework" />
-    <Reference Include="Microsoft.Build.Utilities.v4.0" />
     <Reference Include="mscorlib" />
     <Reference Include="System" />
+    <Reference Include="System.Configuration" />
     <Reference Include="System.Core" />
     <Reference Include="System.Numerics" />
     <Reference Include="System.Runtime.Serialization" />
     <Reference Include="System.Xml" />
-    <Reference Include="System.Xml" />
   </ItemGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.