fix project file

Author: dsyme

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

@@ -222,12 +222,6 @@
     <Compile Include="..\rational.fs">
       <Link>Utilities/rational.fs</Link>
     </Compile>
-    <Compile Include="..\TraceCall.fsi">
-      <Link>Utilities/TraceCall.fsi</Link>
-    </Compile>
-    <Compile Include="..\TraceCall.fs">
-      <Link>Utilities/TraceCall.fs</Link>
-    </Compile>
     <Compile Include="..\range.fsi">
       <Link>ErrorLogging/range.fsi</Link>
     </Compile>