fix nrf52 build

src/concurrency/PosixNotifiedWorkerThread.cpp

@@ -1,4 +1,7 @@
 #include "PosixNotifiedWorkerThread.h"
+
+#ifdef __unix__
+
 #include <Utility.h>
 
 using namespace concurrency;
@@ -11,4 +14,6 @@ void PosixNotifiedWorkerThread::notify(uint32_t v, eNotifyAction action) NOT_IMP
 /**
  * A method that should block execution - either waiting ona queue/mutex or a "task notification"
  */
-void PosixNotifiedWorkerThread::block() NOT_IMPLEMENTED("block");
+void PosixNotifiedWorkerThread::block() NOT_IMPLEMENTED("block");
+
+#endif