Move bionic_macros.h from private to platform.

Test: treehugger
Change-Id: Ie473914f4c8924c7240b3ac22093a9daf42fc948
diff --git a/libc/bionic/pthread_create.cpp b/libc/bionic/pthread_create.cpp
index 03af2d9..4f7ac2b 100644
--- a/libc/bionic/pthread_create.cpp
+++ b/libc/bionic/pthread_create.cpp
@@ -42,7 +42,7 @@
 #include "private/bionic_constants.h"
 #include "private/bionic_defs.h"
 #include "private/bionic_globals.h"
-#include "private/bionic_macros.h"
+#include "platform/bionic/macros.h"
 #include "private/bionic_ssp.h"
 #include "private/bionic_systrace.h"
 #include "private/bionic_tls.h"