Enable very basic tracing support.

Change-Id: I524a857390e0bbc49273989caf56f03b51de65cf
diff --git a/rsCppUtils.h b/rsCppUtils.h
index abae7d8..f16325f 100644
--- a/rsCppUtils.h
+++ b/rsCppUtils.h
@@ -34,6 +34,9 @@
 
 #ifdef RS_SERVER
 
+#define ATRACE_TAG
+#define ATRACE_CALL(...)
+
 #include <string>
 #include <vector>
 #include <algorithm>