sobel: get rid of #version 120 dependent array constructors
sobel: get rid of #version 120 dependent array constructors

mapmapteam/gst-plugins-gl,ystreet/gst-plugins-gl,mapmapteam/gst-plugins-gl,ystreet/gst-plugins-gl,ystreet/gst-plugins-gl,mapmapteam/gst-plugins-gl