Remove useless #includes.

<util.h> is an empty file, and <utmp.h> isn't used by this code.

Bug: http://b/28432688
Change-Id: Ibfd21643c55dc7c0e3ec4a9d89d351ee350995a4
diff --git a/jni/com_android_terminal_Terminal.cpp b/jni/com_android_terminal_Terminal.cpp
index 15e57a3..6d1bdf8 100644
--- a/jni/com_android_terminal_Terminal.cpp
+++ b/jni/com_android_terminal_Terminal.cpp
@@ -30,8 +30,6 @@
 #include <stdio.h>
 #include <termios.h>
 #include <unistd.h>
-#include <util.h>
-#include <utmp.h>
 
 #include <vterm.h>