Remove duplicate FSharp.Core

Author: rneatherway

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

@@ -86,9 +86,6 @@
     <Reference Include="Microsoft.Build.Framework" />
     <Reference Include="Microsoft.Build.Utilities.v4.0" />
     <Reference Include="mscorlib" />
-    <Reference Include="FSharp.Core, Version=$(TargetFSharpCoreVersion), Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
-      <Private>True</Private>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Numerics" />