make tsan happy with running(thr: Thread): bool proc
#24603
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ThreadSanitizer finds a race condition when calling
myThread.running(). Using atomics makes ThreadSanitizer happy but isn't really necessary here IMHO. Still probably good to avoid false positives.I'm not sure if
import std/atomicscan or should be used intypedthreads.nim. It'd be easy to switch to std/sysatomics though.