package/pkg-download: quiet the dl-wrapper call

package/pkg-download: quiet the dl-wrapper call

The download wrapper call is currently always being displayed, even
without V=1, which is a bit annoying. It shows something like this:

thomas@windsurf:~/projets/buildroot (master)$ make tslib-source
>>> tslib 1.16 Downloading
PATH="/home/thomas/projets/buildroot/output/host/bin:/home/thomas/projets/buildroot/output/host/sbin:/usr/local/bin:/usr/bin:/bin:/home/thomas/.rvm/bin:/usr/local/sbin:/usr/sbin:/home/thomas/.rvm/bin:/home/thomas/sys/bin:/home/thomas/.gem/ruby/2.1.0/bin:/home/thomas/.rvm/bin" BR2_DL_DIR=/home/thomas/dl BUILD_DIR=/home/thomas/projets/buildroot/output/build O=/home/thomas/projets/buildroot/output flock /home/thomas/dl/tslib/ support/download/dl-wrapper -c '1.16' -d '/home/thomas/dl/tslib' -D '/home/thomas/dl' -f 'tslib-1.16.tar.xz' -H 'package/tslib//tslib.hash' -n 'tslib-1.16' -N 'tslib' -o '/home/thomas/dl/tslib/tslib-1.16.tar.xz'  -u https+https://github.com/kergoth/tslib/releases/download/1.16 -u http\|urlencode+http://sources.buildroot.net/tslib -u http\|urlencode+http://sources.buildroot.net  --

Let's silence this dl-wrapper call by prepending with $(Q).

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>