SWDEV-301289 - Treewide macro rename

ATI_OS_WIN -> _WIN32
ATI_OS_LINUX -> __linux__

We should not rely on non-standard macros for platform detections.

Change-Id: If1d06e2e1187268df62a59609ea5496ab7eb709d


[ROCm/clr commit: c4aa6febe5]

projects/clr/opencl/tools/cltrace/cltrace.cpp

@@ -4377,7 +4377,7 @@ vdiAgent_OnLoad(vdi_agent * agent)
         std::string clTraceLogStr = clTraceLogEnv;
         const std::size_t pidPos = clTraceLogStr.find("%pid%");
         if (pidPos != std::string::npos) {
-#if defined(ATI_OS_WIN)
+#if defined(_WIN32)
             const std::int32_t pid = _getpid();
 #else
             const std::int32_t pid = getpid();