Backport fix for time.h check for clang compilation · Pull Request !43 · src-openEuler/cyrus-sasl

- 本PR基于[这个oEEP](https://gitee.com/openeuler/TC/blob/master/oEEP/oEEP-0003%20LLVM%E5%B9%B3%E8%A1%8C%E5%AE%87%E5%AE%99%E8%AE%A1%E5%88%92--%E5%9F%BA%E4%BA%8ELLVM%E6%8A%80%E6%9C%AF%E6%A0%88%E6%9E%84%E5%BB%BAoE%E8%BD%AF%E4%BB%B6%E5%8C%85.md)，旨在使得该软件包可以同时支持GCC和LLVM构建。

- backport上游社区PR：[Fix  check by thesamesam · Pull Request #709 · cyrusimap/cyrus-sasl (github.com)](https://github.com/cyrusimap/cyrus-sasl/pull/709/commits/399625c3413c313e93432d0f5907350722b861c7)

- 修改前LLVM构建出现报错：

```
    saslutil.c:280:3: error: call to undeclared function 'time'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      280 |   time(&now);
          |   ^
    saslutil.c:364:34: error: call to undeclared function 'clock'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      364 |             ret[1] ^= (unsigned short) (clock() & 0xFFFF);
          |                                         ^
    saslutil.c:373:22: error: call to undeclared function 'time'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      373 |     curtime = (long) time(NULL); /* better be at least 32 bits */
          |                      ^
    saslutil.c:377:33: error: call to undeclared function 'clock'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      377 |     ret[2] ^= (unsigned short) (clock() & 0xFFFF);
          |                                 ^
    saslutil.c:563:42: warning: comparison of integers of different signs: 'unsigned long' and 'int' [-Wsign-compare]
      563 |         || strlen (result->ai_canonname) > namelen -1) {
          |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
    ```

- 修改后构建成功

- OBS验证工程
  https://build.tarsier-infra.isrc.ac.cn/package/show/home:yy:branches:Mega-LLVM:24.03/cyrus-sasl

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