libutils: Trace.h for everything but windows

libcutils has trace implemented for host. In order to increase code
portability, opening that up for libutils Trace.h usage as well.

Bug: 124524556
Test: use Trace.h on host glinux
Change-Id: Ia873f88e7436a18f6c0f761000bf697c68ffea17

libutils/include/utils/Trace.h

@@ -17,7 +17,12 @@
 #ifndef ANDROID_TRACE_H
 #define ANDROID_TRACE_H
 
-#if defined(__ANDROID__)
+#if defined(_WIN32)
+
+#define ATRACE_NAME(...)
+#define ATRACE_CALL()
+
+#else  // !_WIN32
 
 #include <stdint.h>
 
@@ -51,11 +56,6 @@ private:
 
 }  // namespace android
 
-#else // !__ANDROID__
-
-#define ATRACE_NAME(...)
-#define ATRACE_CALL()
-
-#endif // __ANDROID__
+#endif  // _WIN32
 
 #endif // ANDROID_TRACE_H