wasix: Remove Legacy thread-local System #3877
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Remove deprecated thread_local functionality
thread_local support in wasix was previously implemented via custom
exports provided to modules.
This has been refactored to a more efficient (guest-internal)
implementation in both the wasix libc and the Rust fork.
We kept the exports and related functionality in for a while to allow for
modules to update, but now all the related code can safely be removed.
Closes #3699