Copy over libGLESv2 and libEGL too for nVidia blob

This copies over libEGL.so and libGLESv2.so which were the source of my trouble over at http://lists.science.uu.nl/pipermail/nix-dev/2014-August/013825.html . 

I think we should simply copy every `.so` file there is in the directory rather than be selective for no reason. I did not do so in this PR because of the way it was done already but I see no downside.