editorconfig: Include runtime dependency on editorconfig-core-c

pkgs/applications/editors/emacs-modes/melpa-packages.nix

@@ -59,6 +59,10 @@ self:
         inherit (self.melpaPackages) easy-kill;
       };
 
+      editorconfig = super.editorconfig.overrideAttrs (attrs: {
+        propagatedUserEnvPkgs = [ external.editorconfig-core-c ];
+      });
+
       egg = super.egg.overrideAttrs (attrs: {
         # searches for Git at build time
         nativeBuildInputs =

pkgs/top-level/all-packages.nix

@@ -17814,11 +17814,13 @@ in
     };
 
     external = {
-      inherit (haskellPackages) ghc-mod structured-haskell-mode Agda hindent;
+      inherit (haskellPackages)
+        ghc-mod structured-haskell-mode Agda hindent;
       inherit (pythonPackages) elpy;
       inherit
-        autoconf automake git libffi libpng pkgconfig poppler rtags w3m zlib
-        substituteAll rustPlatform cmake llvmPackages libtool zeromq;
+        autoconf automake editorconfig-core-c git libffi libpng pkgconfig
+        poppler rtags w3m zlib substituteAll rustPlatform cmake llvmPackages
+        libtool zeromq;
     };
   };