fate: delete useless artifacts after running each test

Originally committed as revision 24395 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/fate-run.sh

@@ -63,6 +63,7 @@ pcm(){
 regtest(){
     t="${test#$2-}"
     ref=${base}/ref/$2/$t
+    cleanfiles="$cleanfiles $outfile $errfile"
     outfile=tests/data/regression/$2/$t
     errfile=tests/data/$t.$2.err
     ${base}/${1}-regression.sh $t $2 $3 "$target_exec" "$target_path"
@@ -77,6 +78,7 @@ lavftest(){
 }
 
 lavfitest(){
+    cleanfiles="tests/data/lavfi/*"
     regtest lavfi lavfi tests/vsynth1
 }
 
@@ -113,4 +115,4 @@ esac
 
 cmperr=$?
 test $err = 0 && err=$cmperr
-test $err = 0 && rm -f $outfile $errfile
+test $err = 0 && rm -f $outfile $errfile $cleanfiles