SVN r272273 breaks 'dump'

[Michael Butler]

It seems that the strptime changes broke the recognition of
/etc/dumpdates. Last night's level 2 dump turned into a level 0:

  DUMP: Date of this level 2 dump: Mon Sep 29 00:10:26 2014
  DUMP: Unknown intermediate format in /etc/dumpdates, line 1
  DUMP: Unknown intermediate format in /etc/dumpdates, line 1
  DUMP: Unknown intermediate format in /etc/dumpdates, line 1
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping snapshot of /dev/ada0s3a (/) to standard output
  DUMP: mapping (Pass I) [regular files]

	imb

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