linuxPackages.nvidia_x11*: unmaintain

I now no longer use an nvidia card commonly, so it would be harder for
me to test at least a bit.  And I'm overcommited anyway.
Hopefully someone else can be found.

pkgs/os-specific/linux/nvidia-x11/generic.nix

@@ -90,7 +90,7 @@ let
       description = "X.org driver and kernel module for NVIDIA graphics cards";
       license = licenses.unfreeRedistributable;
       platforms = [ "i686-linux" "x86_64-linux" ];
-      maintainers = [ maintainers.vcunat ];
+      maintainers = [ ];
       priority = 4; # resolves collision with xorg-server's "lib/xorg/modules/extensions/libglx.so"
       inherit broken;
     };