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

opencl/tests/ocltst/module/runtime/OCLCreateBuffer.cpp

@@ -26,7 +26,7 @@
 #include <string.h>
 
 #include <sstream>
-#ifdef ATI_OS_LINUX
+#ifdef __linux__
 #include <unistd.h>
 #endif
 
@@ -79,7 +79,7 @@ void OCLCreateBuffer::run(void) {
   _wrapper->clFinish(cmdQueues_[_deviceId]);
 
   size_t maxSteps = maxSize_;
-#ifdef ATI_OS_LINUX
+#ifdef __linux__
   long pages = sysconf(_SC_PHYS_PAGES);
   long page_size = sysconf(_SC_PAGE_SIZE);
   if (maxSteps > (size_t)(pages * page_size / 2)) {