Remove unused opens

fcs/samples/EditorService/Program.fs

 // Open the namespace with InteractiveChecker type
-open System
-open FSharp.Compiler
 open FSharp.Compiler.SourceCodeServices
 open FSharp.Compiler.QuickParse
 

fcs/samples/FscExe/FscMain.fs

@@ -7,12 +7,10 @@ open System.Diagnostics
 open System.IO
 open System.Reflection
 open System.Runtime.CompilerServices
-open FSharp.Compiler
 open FSharp.Compiler.SourceCodeServices
 open FSharp.Compiler.AbstractIL.IL // runningOnMono 
 open FSharp.Compiler.AbstractIL.Internal.Library
 open FSharp.Compiler.ErrorLogger
-open FSharp.Compiler.Range
 
 #if RESIDENT_COMPILER
 type TypeInThisAssembly() = member x.Dummy = 1

fcs/samples/FsiExe/fsimain.fs

@@ -17,13 +17,11 @@ module internal Sample.FSharp.Compiler.Interactive.Main
 
 open System
 open System.Globalization
-open System.IO
 open System.Reflection
 open System.Threading
 open System.Windows.Forms
 
 open FSharp.Compiler.Interactive.Shell
-open FSharp.Compiler.Interactive
 open FSharp.Compiler
 
 #nowarn "55"

fcs/samples/UntypedTree/Program.fs

 // Open the namespace with InteractiveChecker type
-open System
 open FSharp.Compiler.SourceCodeServices