Throw NotSupportedException for WaitHandle.WaitAny with 64 handle on STA threads

[jkotas]

Fixes #1646

[jkotas]

This is technically a breaking change, but I believe it is better to throw than silently do the wrong thing. It is unlikely that a working program depends on the current broken behavior.

If we agree that that this is a good change to make, I am also going to send PR to update the docs.

[stephentoub]

I was surprised by the lack of exception. I think this is worth changing.

[NN---]

Why breaking ?
On some implementations, if more that 64 handles are passed, a NotSupportedException is thrown.

https://docs.microsoft.com/en-us/dotnet/api/system.threading.waithandle.waitany?view=netframework-4.8#System_Threading_WaitHandle_WaitAny_System_Threading_WaitHandle___

[stephentoub]

Why breaking ?

On an STA thread, passing in 64 handles to WaitAny currently results in it immediately returning a timeout error code. This change makes it throw.

[NN---]

Is it documented somewhere?

[jkotas]

Is it documented somewhere?

It is not that's part of the problem. I am updating the documentation in dotnet/dotnet-api-docs#3767

[danmoseley]

I guess disposing these isn’t important