mastodon: easier build patching

pkgs/servers/mastodon/default.nix

···
   # Allow building a fork or custom version of Mastodon:
 , pname ? "mastodon"
 , version ? srcOverride.version
+, patches ? []
   # src is a package
-, srcOverride ? callPackage ./source.nix {}
+, srcOverride ? callPackage ./source.nix { inherit patches; }
 , gemset ? ./. + "/gemset.nix"
 , yarnHash ? srcOverride.yarnHash
 }:

pkgs/servers/mastodon/source.nix

···
 # This file was generated by pkgs.mastodon.updateScript.
-{ fetchFromGitHub, applyPatches }:
+{ fetchFromGitHub, applyPatches, patches ? [] }:
 let
   version = "4.2.1";
 in
···
       rev = "v${version}";
       hash = "sha256-SM9WdD+xpxo+gfBft9DARV6QjwNbF2Y9McVrrdDT3fw=";
     };
-    patches = [];
+    patches = patches ++ [];
   }) // {
   inherit version;
   yarnHash = "sha256-qoLesubmSvRsXhKwMEWHHXcpcqRszqcdZgHQqnTpNPE=";

pkgs/servers/mastodon/update.sh

···
 
 cat > source.nix << EOF
 # This file was generated by pkgs.mastodon.updateScript.
-{ fetchFromGitHub, applyPatches }:
+{ fetchFromGitHub, applyPatches, patches ? [] }:
 let
   version = "$VERSION";
 in
···
       rev = "v\${version}";
       hash = "$HASH";
     };
-    patches = [$PATCHES];
+    patches = patches ++ [$PATCHES];
   }) // {
   inherit version;
   yarnHash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";