[wasm] Use pthread API for NSLock for wasip1-threads target #5293
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`SWIFT_CORELIBS_FOUNDATION_HAS_THREADS` is not defined for all WASI targets now but we do have pthread support for wasip1-threads target. `_runtime(_multithreaded)` check is more appropriate here to detect multithreaded runtime support. We can remove `SWIFT_CORELIBS_FOUNDATION_HAS_THREADS` definition later.
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Recent wasi-libc versions include pthreads support for wasip1-threads target and a stub implementation for wasip1 target.
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SWIFT_CORELIBS_FOUNDATION_HAS_THREADSis not defined for all WASI targets now but we do have pthread support for wasip1-threads target._runtime(_multithreaded)check is more appropriate here to detect multithreaded runtime support. We can removeSWIFT_CORELIBS_FOUNDATION_HAS_THREADSdefinition later.