Before shouting, pestering, and cursing me for the next 50 generations (go ahead, I'm an atheist so I don't care
), please examine the changes !
Just read the comments in the cool_vl_viewer script...
You will see that gridargs.dat (which was bound to a viewer installation) was not simply removed, but instead replaced with a much better way of specifying custom options (per-Linux account, that will stick with future viewer versions too).
See the NOTE in the very first comment (you can use ~/.secondlife/cool_vl_viewer.conf which is automatically sourced by the script and may contain custom variable overrides, or even a full bash script if you so fancy !), as well as the new LL_SUP_OPT variable around line 126...
So, it's just a matter of typing in a terminal: