Move bionic_macros.h from private to platform.

Test: treehugger
Change-Id: Ie473914f4c8924c7240b3ac22093a9daf42fc948
diff --git a/libc/bionic/locale.cpp b/libc/bionic/locale.cpp
index 8358fb0..0b7037a 100644
--- a/libc/bionic/locale.cpp
+++ b/libc/bionic/locale.cpp
@@ -35,7 +35,7 @@
 #include <time.h>
 #include <wchar.h>
 
-#include "private/bionic_macros.h"
+#include "platform/bionic/macros.h"
 
 #if defined(__BIONIC_BUILD_FOR_ANDROID_SUPPORT)
 #define USE_TLS_SLOT 0