meson: Bump required version to 0.47

This is needed to use option type 'feature'. This is a tri-state
(auto/enabled/disabled) which comes with utility to enable them all, or
disabled them all to avoid any dynamic selection happening. It can also
be used as value to any "required" field.

This will be used in GStreamer support. If you don't have a recent enough
meson in your distribution, you can always install or upgrade your version
using pip3.

  pip3 install --user meson
  pip3 install --user --upgrade meson

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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