Work around Windows test failure

I am uncertain why this works, but it does. Previously, `rtti_test` was
failing due to non-zero data appearing in the `l_buggy` `Buggy_Struct`.

The issue was caused by calling `runtime.default_random_generator` with
a pointer to the state, somehow. The pointer could be on the stack or in
the heap; it did not matter.

I found two workarounds.

- One is to move the RNG setup behind the call to `free_all`.
- The other is to construct the random generator manually.

Despite my digging and testing, I could find no reason as to why this
works or what the fundamental issue was to begin with. If anyone comes
upon this in the future with direct access to a Windows machine, I
recommend stepping through the program with a debugger to investigate
more deeply into why this happens.

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