Fixes: #15333 - Error C2086 while using F# library from CPP/CLI project #15341
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Fixes #15333 Error C2086 while using F# library from CPP/CLI project
Wierdly the C++ cli compiler has issues when importing enums with the value__ given an initial value. C# and F# have no problem when importing it, but C++/CLI does.
The error message is not particularly helpful ... but hey ...

The fix is to ensure that the enum code is generated without initializing the value__ field.
At the same time, I ensured that the enum is serializable and sealed.