Fix include files in backtrace.h.

(cherry picked from commit 08932582226456b8789b52c28462e2224dfcc2e4)

Change-Id: I37a78a9472b94ae84a84d871bfa9a070ff882699
diff --git a/include/backtrace/backtrace.h b/include/backtrace/backtrace.h
index a833982..8a45690 100644
--- a/include/backtrace/backtrace.h
+++ b/include/backtrace/backtrace.h
@@ -17,9 +17,9 @@
 #ifndef _BACKTRACE_H
 #define _BACKTRACE_H
 
-#include <sys/types.h>
+#include <stdint.h>
 #include <stdbool.h>
-#include <inttypes.h>
+#include <sys/types.h>
 
 __BEGIN_DECLS