[Support] Restrict ManagedStatic ThreadPoolExecutor to Windows

https://reviews.llvm.org/D70447 switched to `ManagedStatic` to work
around race conditions in MSVC runtimes and the MinGW runtime.
However, `ManagedStatic` is not suitable for other platforms.

However, this workaround is not suitable for other platforms (#66974).
lld::fatal calls exitLld(1), which calls `llvm_shutdown` to destroy
`ManagedStatic` objects. The worker threads will finish and invoke TLS
destructors (glibc `__call_tls_dtors`). This can lead to race conditions
if other threads attempt to access TLS objects that have already been
destroyed.

While lld's early exit mechanism needs more work, I believe Parallel.cpp
should avoid this pitfall as well.

Pull Request: https://github.com/llvm/llvm-project/pull/102989

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