SWDEV-283930 - Fix bugs in HIP Tests on Windows

Windows doesn't have headers unistd.h, sys/wait.h, so
remove them for _WIN64. Also, Windows doesn't have rand_r
so define it. Fixes builds for HIP tests:
d2dMemCpyWithPinnedHostMemory, hipMemset3DFunctional,
hipModuleLoadMultProcessOnMultGPU,
hipModuleLoadUnloadStress, hipModuleNegative,
hipStreamACb_ThrdBehaviour, hipMemcpyNegativeMThrdMSize,
hipStreamACb_MStrm_Mgpu, StreamAddCallback,
hipStreamACb_StrmSyncTiming, hipStreamACb_MultiCalls,
hipMallocConcurrency, hipMemset3DRegressMultiThread,
and hipSetGetDevice.

Change-Id: Id2f98d664716026c590d879e464ba467d4c071be


[ROCm/hip commit: 9edd31100d]

projects/hip/tests/src/runtimeApi/stream/hipStreamACb_MStrm_Mgpu.cpp

@@ -27,7 +27,9 @@
  */
 
 #include <stdio.h>
+#ifdef __linux__
 #include <unistd.h>
+#endif
 #include <thread>
 #include <chrono>
 #include "hip/hip_runtime.h"