cleanup FX_LCIDFROMCODEPAGE (#7509)

Author: KevinRansom

FSharp.Profiles.props

@@ -6,7 +6,6 @@
     <DefineConstants Condition="'$(MonoPackaging)' == 'true'">$(DefineConstants);CROSS_PLATFORM_COMPILER</DefineConstants>
     <DefineConstants>$(DefineConstants);ENABLE_MONO_SUPPORT</DefineConstants>
     <DefineConstants>$(DefineConstants);BE_SECURITY_TRANSPARENT</DefineConstants>
-    <DefineConstants>$(DefineConstants);FX_LCIDFROMCODEPAGE</DefineConstants>
   </PropertyGroup>
 
   <PropertyGroup Condition="$(TargetFramework.StartsWith('netstandard')) OR $(TargetFramework.StartsWith('netcoreapp'))">

src/fsharp/fsc.fs

@@ -1774,15 +1774,13 @@ let main0(ctok, argv, legacyReferenceResolver, bannerAlreadyPrinted,
           exiter: Exiter, errorLoggerProvider : ErrorLoggerProvider, disposables : DisposablesTracker) = 
 
     // See Bug 735819 
-    let lcidFromCodePage = 
-#if FX_LCIDFROMCODEPAGE
+    let lcidFromCodePage =
         if (Console.OutputEncoding.CodePage <> 65001) &&
            (Console.OutputEncoding.CodePage <> Thread.CurrentThread.CurrentUICulture.TextInfo.OEMCodePage) &&
            (Console.OutputEncoding.CodePage <> Thread.CurrentThread.CurrentUICulture.TextInfo.ANSICodePage) then
                 Thread.CurrentThread.CurrentUICulture <- new CultureInfo("en-US")
                 Some 1033
         else
-#endif
             None
 
     let directoryBuildingFrom = Directory.GetCurrentDirectory()