Removed unused include of <sys/resource.h> instead of depending on

namespace pollution only 1 layer deep in <sys/stat.h> for its
prerequisite <sys/time.h>

Removed other unused includes.

libexec/getty/chat.c

@@ -28,26 +28,16 @@ static const char rcsid[] =
   "$FreeBSD$";
 #endif /* not lint */
 
-#include <sys/param.h>
-#include <sys/stat.h>
+#include <sys/types.h>
 #include <sys/ioctl.h>
-#include <sys/resource.h>
-#include <sys/ttydefaults.h>
 #include <sys/utsname.h>
+
 #include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <libutil.h>
-#include <locale.h>
-#include <setjmp.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <string.h>
 #include <syslog.h>
-#include <time.h>
-#include <termios.h>
 #include <unistd.h>
-#include <sys/socket.h>
 
 #include "extern.h"