修复IAR的dlib时间映射，支持64bit的时间。

components/libc/compilers/dlib/time.c

@@ -32,12 +32,11 @@ int gettimeofday(struct timeval *tp, void *ignore)
  * @return time_t return timestamp current.
  *
  */
-/* for IAR 6.2 later Compiler */
-#if defined (__IAR_SYSTEMS_ICC__) &&  (__VER__) >= 6020000
 #pragma module_name = "?time"
-time_t (__time32)(time_t *t) /* Only supports 32-bit timestamp */
+#if _DLIB_TIME_ALLOW_64
+time_t __time64(time_t *t)
 #else
-time_t time(time_t *t)
+time_t __time32(time_t *t)
 #endif
 {
   time_t time_now = 0;