Refine DebugHelper.h into Log.h.

This removes USE_FUNC_LOGGER from libbcc-config.mk.
diff --git a/lib/RenderScript/RSScript.cpp b/lib/RenderScript/RSScript.cpp
index 4cf8475..ef39897 100644
--- a/lib/RenderScript/RSScript.cpp
+++ b/lib/RenderScript/RSScript.cpp
@@ -20,7 +20,7 @@
 
 #include <llvm/ADT/STLExtras.h>
 
-#include "bcc/Support/DebugHelper.h"
+#include "bcc/Support/Log.h"
 
 using namespace bcc;