minui: Don't include errno.h twice

Change-Id: Id119ca2f34fb072e70037dbb6858799e94c74043
diff --git a/minui/events.cpp b/minui/events.cpp
index f67684b..c777996 100644
--- a/minui/events.cpp
+++ b/minui/events.cpp
@@ -24,7 +24,6 @@
 #include <sys/epoll.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
-#include <errno.h>
 
 #include <functional>