Move bionic_macros.h from private to platform.

Test: treehugger
Change-Id: Ie473914f4c8924c7240b3ac22093a9daf42fc948
diff --git a/libc/bionic/ndk_cruft.cpp b/libc/bionic/ndk_cruft.cpp
index c816830..e9a5b5b 100644
--- a/libc/bionic/ndk_cruft.cpp
+++ b/libc/bionic/ndk_cruft.cpp
@@ -45,7 +45,7 @@
 #include <unistd.h>
 #include <wchar.h>
 
-#include "private/bionic_macros.h"
+#include "platform/bionic/macros.h"
 
 extern "C" {