Add a missing #include for openat(2).

Bug: https://code.google.com/p/android/issues/detail?id=64374
Test: builds
Change-Id: I7d7650463197710657820a1adce51f71c1b01415
diff --git a/minui/events.cpp b/minui/events.cpp
index 6dd60fe..fa44033 100644
--- a/minui/events.cpp
+++ b/minui/events.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <dirent.h>
+#include <fcntl.h>
 #include <linux/input.h>
 #include <stdio.h>
 #include <stdlib.h>