idmap: scan missing include for sys/stat.h

scan.cpp gets sys/stat.h inherited from
private/android_filesystem_config.h it should
not rely on this in the future. The intent is
to move fs_config function into libcutils and
thus deprecate any need for sys/stat.h in this
include file.

Bug: 19908228
Change-Id: If547e86513b06c536972138ae571c3d9c714ffe9

cmds/idmap/scan.cpp

@@ -1,3 +1,6 @@
+#include <dirent.h>
+#include <sys/stat.h>
+
 #include "idmap.h"
 
 #include <UniquePtr.h>
@@ -9,8 +12,6 @@
 #include <utils/String16.h>
 #include <utils/String8.h>
 
-#include <dirent.h>
-
 #define NO_OVERLAY_TAG (-1000)
 
 using namespace android;