[bugs #11879] all mount-points lstat()-ed, but shouldn't be

[Dmitry V. Levin]

Follow-up Comment #3, bugs #11879 (project findutils):

1. this hunk looks odd:

+  time(NULL);
+  opendir(".");
+  time(NULL);
+

2. safely_chdir_nofollow() will switch to safely_chdir_lstat() if open()
fails due to some race.

3. I'd prefer to avoid runtime fallback to safely_chdir_lstat() on platforms
where fchdir() is known to work.

4. At this moment, safely_chdir_nofollow() does less then
safely_chdir_lstat().  Maybe some stuff could be moved back to
safely_chdir()?

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