Add systrace output for dlopen calls

Bug: http://b/27195126
Test: manual: adb shell atrace -t 5 bionic
      and run bionic-unit-tests --gtest_filter=dl*:Dl*

Change-Id: Ib2bad794e571b89bd1f52c9e0de642c2092e5c21
diff --git a/linker/linker_logger.h b/linker/linker_logger.h
index 502f872..f37b974 100644
--- a/linker/linker_logger.h
+++ b/linker/linker_logger.h
@@ -32,6 +32,7 @@
 #include <stdlib.h>
 #include <limits.h>
 #include "private/bionic_macros.h"
+#include "private/bionic_systrace.h"
 
 #define LD_LOG(type, x...) \
   { \