Console.Write now produces output on all build flavours (#2782)

***NO_CI***

Author: josesimoes

src/CLR/CorLib/corlib_native_System_Diagnostics_Debug.cpp

@@ -1,6 +1,5 @@
 //
 // Copyright (c) .NET Foundation and Contributors
-// Portions Copyright (c) Microsoft Corporation.  All rights reserved.
 // See LICENSE file in the project root for full license information.
 //
 
@@ -11,15 +10,13 @@ HRESULT Library_corlib_native_System_Diagnostics_Debug::WriteLineNative___STATIC
 {
     NANOCLR_HEADER();
 
-#ifdef BUILD_RTM
-    stack.NotImplementedStub();
-#else
-
     const char *szText0 = stack.Arg0().RecoverString();
     bool addLineFeed = (bool)stack.Arg1().NumericByRef().u1;
 
     if (!szText0)
+    {
         szText0 = "<null>";
+    }
 
     CLR_Debug::Emit(szText0, -1);
 
@@ -28,7 +25,5 @@ HRESULT Library_corlib_native_System_Diagnostics_Debug::WriteLineNative___STATIC
         CLR_Debug::Emit("\r\n", -1);
     }
 
-#endif
-
     NANOCLR_NOCLEANUP_NOLABEL();
 }