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access always computes result with real ids not effective ones, so it
is not a valid means of determining whether the directory is readable.
instead, attempt to open it before reporting whether it's readable,
and then use fdopendir rather than opendir to open and read the
entries.
effort is made here to keep fd_limit behavior the same as before even
if it was not correct.
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the LFS64 macro was not self-documenting and barely saved any
characters. simply use weak_alias directly so that it's clear what's
being done, and doesn't depend on a header to provide a strange macro.
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the rightmost '/' character is not necessarily the delimiter before
the basename; it could be a spurious trailing character on the
directory name.
this change does not introduce any normalization of pathnames or
stripping of trailing slashes, contrary to at least glibc and perhaps
other implementations; it jusst prevents their presence from breaking
things. whether further changes should be made is an open question
that may depend on conformance and/or application compatibility
considerations.
based loosely on patch by Joakim Sindholt.
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the incorrect check for crossing device boundaries was preventing nftw
from traversing anything except the initially provided pathname.
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