Fix a typo when using the $(download) function. This suppresses
malformed url errors from curl.
Signed-off-by: Rafaël Carré <funman@videolan.org>
(cherry picked from commit fb1e33a46fab56f852457165bd2a17d1f427ae3a)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>