libjpeg(_turbo): minor update 1.3.0 -> .1

The security patch got incorporated into the release.
mesa: add symlinks from $out/lib/*.so to $drivers/lib

This is mainly in order for libGL to be present in /run/opengl-drivers{,-32}.
Now even with mesa drivers pkgs will use your current nixos libGL
instead of the one it was built against.

Thanks to @iElectric for suggesting this change.
xorg: add "intel-testing" video driver, currently 2.99.911