emacsPackages*: Move to emacs*.pkgs

This makes it much easier to create customisations around emacs via
the a new convenience passthru attr:
- `emacs.pkgs`: What used to be emacsPackages is now `emacs.pkgs`

The previous versioned names `emacs*Packages` have been moved to
aliases.nix and are now considered deprecated in favour of `emacs*.pkgs`.

pkgs/applications/editors/emacs/generic.nix

@@ -11,6 +11,7 @@
 , libtiff, librsvg, gconf, libxml2, imagemagick, gnutls, libselinux
 , alsaLib, cairo, acl, gpm, AppKit, GSS, ImageIO, m17n_lib, libotf
 , jansson, harfbuzz
+, dontRecurseIntoAttrs ,emacsPackagesFor
 , libgccjit, targetPlatform, makeWrapper # native-comp params
 , systemd ? null
 , withX ? !stdenv.isDarwin
@@ -40,9 +41,7 @@ assert withGTK3 -> !withGTK2 && gtk3-x11 != null;
 assert withXwidgets -> withGTK3 && webkitgtk != null;
 
 
-let
-
-in stdenv.mkDerivation (lib.optionalAttrs nativeComp {
+let emacs = stdenv.mkDerivation (lib.optionalAttrs nativeComp {
   NATIVE_FULL_AOT = "1";
   LIBRARY_PATH = "${lib.getLib stdenv.cc.libc}/lib";
 } // lib.optionalAttrs stdenv.isDarwin {
@@ -175,6 +174,7 @@ in stdenv.mkDerivation (lib.optionalAttrs nativeComp {
 
   passthru = {
     inherit nativeComp;
+    pkgs = dontRecurseIntoAttrs (emacsPackagesFor emacs);
   };
 
   meta = with lib; {
@@ -201,4 +201,5 @@ in stdenv.mkDerivation (lib.optionalAttrs nativeComp {
       separately.
     '';
   };
-})
+});
+in emacs