Remove use of AC_HEADER_TIME, only obsolete platforms actually

need this.  Also stop removing sys/time.h unless the source file
uses struct timeval.

src/sesh.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2010-2016 Todd C. Miller <Todd.Miller@sudo.ws>
+ * Copyright (c) 2008, 2010-2018 Todd C. Miller <Todd.Miller@sudo.ws>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -20,7 +20,6 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <sys/time.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
@@ -28,15 +27,13 @@
 #include <stdlib.h>
 #include <string.h>
 #include <signal.h>
+#include <time.h>
 #include <unistd.h>
 #ifdef HAVE_STDBOOL_H
 # include <stdbool.h>
 #else
 # include "compat/stdbool.h"
 #endif /* HAVE_STDBOOL_H */
-#ifdef TIME_WITH_SYS_TIME
-# include <time.h>
-#endif
 
 #include "sudo_gettext.h"	/* must be included before sudo_compat.h */