vc4: Don't forget to make our raster shadow textures non-raster.
vc4: Don't forget to make our raster shadow textures non-raster.

Not sure what happened in my testing that made the previous shadow
code fix glxgears swapbuffering, but this also fixes lots of CopyArea
in X (like dragging xlogo around in metacity).

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler