[build] better autoconf checks for time and dirent headers

src/bench.c

@@ -1,9 +1,20 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+ 
+#ifdef TIME_WITH_SYS_TIME
 #include <sys/time.h>
+#include <time.h>
+#else
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#else
+#include <time.h>
+#endif
+#endif
 
 #include "libpostal.h"
+#include "libpostal_config.h"
 #include "log/log.h"
 #include "scanner.h"