uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/servers/mail/mailman/default.nix

@@ -0,0 +1,33 @@
+{ newScope, lib, python3 }:
+
+let
+  callPackage = newScope self;
+
+  self = lib.makeExtensible (self: {
+    python3 = callPackage ./python.nix { inherit python3; };
+
+    hyperkitty = callPackage ./hyperkitty.nix { };
+
+    mailman = callPackage ./package.nix { };
+
+    mailman-hyperkitty = callPackage ./mailman-hyperkitty.nix { };
+
+    postorius = callPackage ./postorius.nix { };
+
+    web = callPackage ./web.nix { };
+
+    buildEnvs = { web ? self.web
+                , mailman ? self.mailman
+                , mailman-hyperkitty ? self.mailman-hyperkitty
+                , withHyperkitty ? false
+                }:
+      {
+        mailmanEnv = self.python3.withPackages
+          (ps: [ mailman ps.psycopg2 ]
+            ++ lib.optional withHyperkitty mailman-hyperkitty);
+        webEnv = self.python3.withPackages
+          (ps: [ web ps.psycopg2 ]);
+      };
+  });
+
+in self