Add license headers and simplify main

Commit migrated from dotnet/corefx@d177380

src/libraries/System.Diagnostics.FileVersionInfo/tests/NativeConsoleApp/NativeConsoleApp.cpp

@@ -1,8 +1,8 @@
-#include <stdio.h>
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
 int main()
 {
-    printf("Hello World");
-
     return 0;
 }

src/libraries/System.Diagnostics.FileVersionInfo/tests/NativeLibrary/dllmain.cpp

@@ -1,3 +1,7 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
 #define WIN32_LEAN_AND_MEAN             // Exclude rarely-used stuff from Windows headers
 // Windows Header Files:
 #include <windows.h>

src/libraries/System.Diagnostics.FileVersionInfo/tests/SecondNativeLibrary/dllmain.cpp

@@ -1,3 +1,7 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
 #define WIN32_LEAN_AND_MEAN             // Exclude rarely-used stuff from Windows headers
 // Windows Header Files:
 #include <windows.h>