interface.master: Added #ifdefs around wrappers which need AT_SYMLINK_NOFOLLOW
interface.master: Added #ifdefs around wrappers which need AT_SYMLINK_NOFOLLOW

- AT_SYMLINK_NOFOLLOW is defined only in newer systems, for example
  debian etch does not have it.
- As a side effect, this removes c.a 8 wrappers from the preload library
  on systems where AT_SYMLINK_NOFOLLOW is not defined, but that should be
  harmless: If that symbol isn't defined, then the wrapped functions should
  not exist either.

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