Update dar to 2.3.1.

Patch provided by Martin Wilke via PR 34430.

- Changelog

	from 2.3.0 to 2.3.1

	- set back Nick Alcock's patch which has been dropped from
	  2.2.x to 2.3.x (patch name is "Do not moan about every
	  single file on a non-ext2 filesystem")
	- fixed compilation problem when thread-safe code is disabled
	- integrated Wiebe Cazemier's patch for dar's man page
	- fixed bug in listing: -as option also listed files that
	  had EA even when theses were not saved in the archive
	- file permission of installed sample scripts lacked the
	  executable bit
	- fixed a bug that appeared when a file is removed while at
	  the time it is saved by dar
	- avoid having an unnecessary warning appearing when
  	restoring a file in a directory that has default EA set
	- Cygwin has changed and does not support anymore the path
 	 in the form "c:/some/where", you have to use
 	 "/cygdrive/c/some/where" instead. Documentation has been
 	 updated in consequence.

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