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

tests/src/test_common.cpp

@@ -53,6 +53,14 @@ const char* PATH_SEPERATOR_STR = "/";
 const char* NULL_DEVICE = "/dev/null";
 #endif
 
+#ifdef _WIN64
+// Windows does not have rand_r, use srand and rand instead.
+int rand_r(unsigned int* s) {
+  srand(*s);
+  return rand();
+}
+#endif
+
 // Get Free Memory from the system
 static size_t getMemoryAmount() {
 #if __linux__