emacsWithPackages: load compiled site-start.el of $emacs if possible
The first log in *Message* before this patch:
Loading /nix/store/bikm18vy6v07hmrvrll501i68440w9iw-emacs-29.1-rc1/share/emacs/site-lisp/site-start.el (source)...done
and after this patch:
Loading /nix/store/bikm18vy6v07hmrvrll501i68440w9iw-emacs-29.1-rc1/share/emacs/site-lisp/site-start (native compiled elisp)...done
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