Move bionic_macros.h from private to platform.

Test: treehugger
Change-Id: Ie473914f4c8924c7240b3ac22093a9daf42fc948
diff --git a/libc/bionic/scudo/scudo.cpp b/libc/bionic/scudo/scudo.cpp
index fb09b92..2cd36b1 100644
--- a/libc/bionic/scudo/scudo.cpp
+++ b/libc/bionic/scudo/scudo.cpp
@@ -33,7 +33,7 @@
 #include <sys/param.h>
 #include <sys/prctl.h>
 
-#include "private/bionic_macros.h"
+#include "platform/bionic/macros.h"
 
 #include "scudo.h"