Remove udev from /run/opengl-drivers

/run/opengl-drivers should contain only libGL-related libraries, not
stuff like udev. Injecting anything into LD_LIBRARY_PATH is dangerous
because it can break applications that expect a different version of
the library.

Caused by eef9a8ac2a30b495ff7184382ed0dbd73b3b88e4. Fixes #5371.

nixos/modules/hardware/opengl.nix

···
       [ p.mesa_drivers
         p.mesa_noglu # mainly for libGL
         (if cfg.s3tcSupport then p.libtxc_dxtn else p.libtxc_dxtn_s2tc)
-        p.udev
       ];
   };