emacs: use runCommand to generate wrapper

This removes the unnecessary compiler build dependency. We also set

    preferLocalBuild = true;
    allowSubstitutes = false;

to not farm out the build on a remote builder or bother with trying to
find a binary substitution.

pkgs/build-support/emacs/wrapper.nix

@@ -32,7 +32,7 @@ in customEmacsPackages.emacsWithPackages (epkgs: [ epkgs.evil epkgs.magit ])
 
 */
 
-{ lib, lndir, makeWrapper, runCommand, stdenv }: self:
+{ lib, lndir, makeWrapper, runCommand }: self:
 
 with lib; let inherit (self) emacs; in
 
@@ -45,11 +45,15 @@ let
     else packagesFun;
 in
 
-stdenv.mkDerivation {
-  name = (appendToName "with-packages" emacs).name;
+runCommand
+  (appendToName "with-packages" emacs).name
+  {
     nativeBuildInputs = [ emacs lndir makeWrapper ];
     inherit emacs explicitRequires;
 
+    preferLocalBuild = true;
+    allowSubstitutes = false;
+
     # Store all paths we want to add to emacs here, so that we only need to add
     # one path to the load lists
     deps = runCommand "emacs-packages-deps"
@@ -142,8 +146,9 @@ EOF
         $emacs/bin/emacs --batch -f batch-byte-compile "$siteStart" "$subdirs"
       '';
 
-  phases = [ "installPhase" ];
-  installPhase = ''
+    inherit (emacs) meta;
+  }
+  ''
     mkdir -p "$out/bin"
 
     # Wrap emacs and friends so they find our site-start.el before the original.
@@ -172,6 +177,4 @@ EOF
     for dir in applications icons info man; do
       ln -s $emacs/share/$dir $out/share/$dir
     done
-  '';
-  inherit (emacs) meta;
-}
+  ''

pkgs/top-level/emacs-packages.nix

@@ -60,7 +60,7 @@ let
   };
 
   emacsWithPackages = import ../build-support/emacs/wrapper.nix {
-    inherit lib lndir makeWrapper stdenv runCommand;
+    inherit lib lndir makeWrapper runCommand;
   };
 
   mkManualPackages = import ../applications/editors/emacs-modes/manual-packages.nix {