Move bionic_macros.h from private to platform.

Test: treehugger
Change-Id: Ie473914f4c8924c7240b3ac22093a9daf42fc948
diff --git a/libc/bionic/grp_pwd_file.h b/libc/bionic/grp_pwd_file.h
index 9004c4e..69c771b 100644
--- a/libc/bionic/grp_pwd_file.h
+++ b/libc/bionic/grp_pwd_file.h
@@ -32,7 +32,7 @@
 #include <pwd.h>
 
 #include "private/bionic_lock.h"
-#include "private/bionic_macros.h"
+#include "platform/bionic/macros.h"
 #include "private/grp_pwd.h"
 
 class MmapFile {