[wasm] Remove no longer used threading compile-time defines #5319
+50
−79
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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.
Recent wasi-libc versions include pthreads support for wasip1-threads target and a stub implementation for wasip1 target.
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Depends on #5293
After #5293, we no longer rely on
SWIFT_CORELIBS_FOUNDATION_HAS_THREADSdefinitions