nixgl: fix wrapper for separateDebugInfo pkgs

modules/misc/nixgl.nix

@@ -30,6 +30,12 @@ in {
       # the outputs and derivation attributes.
         (pkg.overrideAttrs (old: {
           name = "nixGL-${pkg.name}";
+
+          # Make sure this is false for the wrapper derivation, so nix doesn't expect
+          # a new debug output to be produced. We won't be producing any debug info
+          # for the original package.
+          separateDebugInfo = false;
+
           buildCommand = ''
             set -eo pipefail