inconsistent redundancy in chdir.2

Dear Mr. Kerrisk,

I'm sorry for possibly two messages on the same subject - i mistyped the CC address.

Thank you for maintaining the Linux man-pages.

Updating the outdated translation of chdir.2 for manpages-de I found

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

      fchdir():
          _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
          _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
          || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

and as last (third) part of NOTES

The prototype for fchdir() is only available if _BSD_SOURCE is defined,
or _XOPEN_SOURCE is defined with the value 500.

This is almost the same of the first two possibilities above.

Please check whether >= or = is right and consider dropping/extending the last
paragraph of the NOTES.

Kind regards
Martin Schauer

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