fish handling of readlink()

The readlink() function does not null terminate the path it returns.

Remove the OS X code that deals with a path buffer that is too short. For
one thing a loop isn't needed since we're told how big of a buffer
is required if the first _NSGetExecutablePath() call fails. But more
important it is so unlikely that the path will be longer than PATH_MAX
that if it is we should just give up.

Fixes 2931.

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