Windows: handle CM_ERROR_RETRY in cm_Analyze()

cm_Analyze() was not forcing a retry when it received CM_ERROR_RETRY.

Change-Id: I5c392623a3917bebdd5cb9bd86b030395d7a7d48
Reviewed-on: http://gerrit.openafs.org/8949
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>