Unbreak the tests after r347002.

MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation

usr.bin/stat/tests/stat_test.sh

@@ -184,6 +184,7 @@ x_output()
 	local path=$1; shift
 
 	local atime_s=$(x_output_date -f '%Sa' $path)
+	local btime_s=$(x_output_date -f '%SB' $path)
 	local ctime_s=$(x_output_date -f '%Sc' $path)
 	local devid=$(stat -f '%Hd,%Ld' $path)
 	local file_type_s=$(stat -f '%HT' $path)
@@ -206,6 +207,7 @@ Device: $devid   Inode: $inode    Links: $nlink
 Access: $atime_s
 Modify: $mtime_s
 Change: $ctime_s
+ Birth: $btime_s
 EOF
 }