nut: strip debug symbols from cgi-bin/

Noticed by Majiir Paktu as a `gcc` development bits in the closure.
The change remove 10 dependencies worth of 150MB from the closure:

Before:

$ nix path-info -rsSh ./result-before | nl | tail -n1
144 /nix/store/b0jsf912bix056gg3p1nz8lh3yasm82j-nut-2.8.0 10.0M 567.7M

After:

$ nix path-info -rsSh ./result | nl | tail -n1
134 /nix/store/gniv2fpm7qxdiszqwhz81iyvxpc62n52-nut-2.8.0 9.7M 343.8M

pkgs/applications/misc/nut/default.nix

···
 
   enableParallelBuilding = true;
 
+  # Add `cgi-bin` to the default list to avoid pulling in whole
+  # of `gcc` into build closure.
+  stripDebugList = [ "cgi-bin" "lib" "lib32" "lib64" "libexec" "bin" "sbin" ];
+
   postInstall = ''
     substituteInPlace $out/lib/systemd/system-shutdown/nutshutdown \
       --replace /bin/sleep "${coreutils}/bin/sleep" \