Fix 64-bit build.

Change-Id: I9f2e2edf276f98864b65708b746bf938a4a3c8d6
diff --git a/libs/hwui/JankTracker.cpp b/libs/hwui/JankTracker.cpp
index a72faea..cc5c403 100644
--- a/libs/hwui/JankTracker.cpp
+++ b/libs/hwui/JankTracker.cpp
@@ -239,7 +239,7 @@
 }
 
 void JankTracker::dumpData(const ProfileData* data, int fd) {
-    dprintf(fd, "\nStats since: %lluns", data->statStartTime);
+    dprintf(fd, "\nStats since: %" PRIu64 "ns", data->statStartTime);
     dprintf(fd, "\nTotal frames rendered: %u", data->totalFrameCount);
     dprintf(fd, "\nJanky frames: %u (%.2f%%)", data->jankFrameCount,
             (float) data->jankFrameCount / (float) data->totalFrameCount * 100.0f);