emacs: refactor: fetchzip→fetchgit

In preparation for fetching pre-releases, which are not available in the
standard GNU mirrors, just in the ‘alpha’ ones.

srcRepo has been flipped, since repo states do not include the
autoconf/automake generated files of the release tarballs.

emacs-macport, which was already built from repo sources, had to enable
srcRepo, which the flip makes it redundant, and hence is gone.

pkgs/applications/editors/emacs/default.nix

@@ -13,7 +13,7 @@ lib.makeScope pkgs.newScope (
       inherit lib;
       inherit (pkgs)
         fetchFromGitHub
-        fetchzip
+        fetchgit
         ;
     };
 
@@ -31,11 +31,6 @@ lib.makeScope pkgs.newScope (
       withPgtk = true;
     };
 
-    emacs30-macport = callPackage (self.sources.emacs30-macport) (
-      inheritedArgs
-      // {
-        srcRepo = true;
-      }
-    );
+    emacs30-macport = callPackage (self.sources.emacs30-macport) inheritedArgs;
   }
 )

pkgs/applications/editors/emacs/make-emacs.nix

@@ -66,7 +66,7 @@
   # Boolean flags
   withNativeCompilation ? stdenv.buildPlatform.canExecute stdenv.hostPlatform,
   noGui ? false,
-  srcRepo ? false,
+  srcRepo ? true,
   withAcl ? false,
   withAlsaLib ? false,
   withAthena ? false,

pkgs/applications/editors/emacs/sources.nix

@@ -1,7 +1,7 @@
 {
   lib,
   fetchFromGitHub,
-  fetchzip,
+  fetchgit,
 }:
 
 let
@@ -26,9 +26,9 @@ let
       src =
         {
           "mainline" = (
-            fetchzip {
-              url = "mirror://gnu/emacs/${rev}.tar.xz";
-              inherit hash;
+            fetchgit {
+              url = "https://https.git.savannah.gnu.org/git/emacs.git";
+              inherit rev hash;
             }
           );
           "macport" = (