more structural improvements

utils/nixGLWrap.nix

@@ -0,0 +1,17 @@
+{ pkgs, lib, ... }:
+
+let nixgl = import <nixgl> { };
+in pkg:
+pkgs.runCommand "${pkg.name}-nixgl-wrapper" { } ''
+  mkdir $out
+  ln -s ${pkg}/* $out
+  rm $out/bin
+  mkdir $out/bin
+  for bin in ${pkg}/bin/*; do
+  wrapped_bin=$out/bin/$(basename $bin)
+  echo -e "#!/bin/bash\nexec ${
+    lib.getExe nixgl.auto.nixGLDefault
+  } $bin \$@" > $wrapped_bin
+  chmod +x $wrapped_bin
+  done
+''