common_time_server.cpp: more O_CLOEXEC

Change-Id: I2185a462d72e11f5a015c525d2d37c52ecc3e430
diff --git a/libs/common_time/common_time_server.cpp b/libs/common_time/common_time_server.cpp
index 01372e0..f72ffaa 100644
--- a/libs/common_time/common_time_server.cpp
+++ b/libs/common_time/common_time_server.cpp
@@ -143,7 +143,7 @@
 
     // Create the eventfd we will use to signal our thread to wake up when
     // needed.
-    mWakeupThreadFD = eventfd(0, EFD_NONBLOCK);
+    mWakeupThreadFD = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
 
     // seed the random number generator (used to generated timeline IDs)
     srand48(static_cast<unsigned int>(systemTime()));