Autodetect if fuser supports -s
    
    2010-03-22  Miloslav Trmač  <mitr@redhat.com>
    
    	* configure.ac: Check if fuser supports -s.
    	* tmpwatch.c (check_fuser): Redirect stdout and stderr instead of using
    	-s if !FUSER_ACCEPTS_S.
    	All based on a patch by Ben Walton <bwalton@artsci.utoronto.ca>
    	(FUSER_ARGS): Remove, simply use "-s" directly.