Have util/mktar.sh display the absolute path to the tarball

Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/7696)

(cherry picked from commit 3be389435f)

util/mktar.sh

@@ -30,4 +30,7 @@ if [ -z "$TARFILE" ]; then TARFILE="$NAME.tar"; fi
 git archive --worktree-attributes --format=tar --prefix="$NAME/" -v HEAD \
     | gzip -9 > "$TARFILE.gz"
 
-ls -l "$TARFILE.gz"
+# Good old way to ensure we display an absolute path
+td=`dirname $TARFILE`
+tf=`basename $TARFILE`
+ls -l "`cd $td; pwd`/$tf.gz"