atomic_store wasn't working on windows

Evan Hunt requested to merge each-fix-win32-build into master
  • fixed a typo in the win32 version of the atomic_store macro
  • moved the unix version to lib/isc/unix/include/isc so it's more obvious in the future that it isn't the only copy
  • add atomic_bool implementation in win32 version of stdatomic.h
  • fixed copy&paste error in win32 atomic_fetch_add macro
Edited by Ondřej Surý

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