Windows: cm_BPlusDirNextEnumEntry return all errors

Return all entries in the directory enumeration regardless of any
errors returned from cm_BPlusDirEnumBulkStatNext().  Set the error
code in the returned cm_direnum_entry_t.errorCode field so that
the caller can determine how the error should be handled on a
per entry basis.

Change-Id: I90a90ab0b0220c8d1e045f9473f5edd0bd01e45e
Reviewed-on: http://gerrit.openafs.org/9103
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>