Merge pull request #1899 from hichard/master

修复iar dlib时间映射函数的函数声明，适应不同版本的iar

components/libc/compilers/dlib/time.c

@@ -42,9 +42,9 @@ int gettimeofday(struct timeval *tp, void *ignore)
  */
 #pragma module_name = "?time"
 #if _DLIB_TIME_ALLOW_64
-time_t __time64(time_t *t)
+__time64_t __time64(__time64_t *t)
 #else
-time_t __time32(time_t *t)
+__time32_t __time32(__time32_t *t)
 #endif
 {
   time_t time_now = 0;