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v4l2: Warn a user when GST_V4L2_USE_LIBV4L2 is not honored

Andrzej Pietrasiewicz requested to merge andrzej.p/gst-plugins-good:warn-if-no-libv4l into master

Users might get a gstreamer installation which they didn't build, so they don't know if libv4l2 support is compiled in or not. This patch adds a warning message in case user requests an impossible situation.

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