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

Lin Jian 6505082e 1506ab49

Changed files
+1 -1
pkgs
build-support
emacs
+1 -1
pkgs/build-support/emacs/wrapper.nix
···
rm -f $siteStart $siteStartByteCompiled $subdirs $subdirsByteCompiled
cat >"$siteStart" <<EOF
(let ((inhibit-message t))
-
(load-file "$emacs/share/emacs/site-lisp/site-start.el"))
+
(load "$emacs/share/emacs/site-lisp/site-start"))
;; "$out/share/emacs/site-lisp" is added to load-path in wrapper.sh
;; "$out/share/emacs/native-lisp" is added to native-comp-eln-load-path in wrapper.sh
(add-to-list 'exec-path "$out/bin")