fetchmail-6.4.5 (unreleased):

## REGRESSION FIX:
* fetchmail 6.4.0 and 6.4.1 changed the resolution of the home directory
  in a way that requires SUSv4 semantics of realpath(), which leads to
  'Cannot find absolute path for... directory' error messages followed by aborts
  on systems where realpath() follows strict SUSv2 semantics and returns
  EINVAL if the 2nd argument is NULL.

  On such systems, for instance, Solaris 10, fetchmail requires PATH_MAX to be
  defined, and will then work again.  Regression reported by David Hough.

  On systems that neither provide auto-allocation semantics for realpath(),
  nor PATH_MAX, fetchmail will print this error and abort. Such systems
  are unsupported, see README.

## CHANGES:
* Add a test program fm_realpath, and a t.realpath script, neither to be
  installed. These will test resolution of the current working directory.

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