get seek regression test filenames from reference file

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11831 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

tests/seek_test.sh

@@ -8,7 +8,7 @@ datadir="tests/data"
 logfile="$datadir/seek.regression"
 reffile="$1"
 
-list=`ls tests/data/a-* tests/data/b-* | sort`
+list=`grep '^tests/data/[ab]-' "$reffile"`
 rm -f $logfile
 for i in $list ; do
     echo ---------------- >> $logfile