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>

doc/builders/packages/elm.section.md

@@ -0,0 +1,11 @@
+# Elm {#sec-elm}
+
+To start a development environment, run:
+
+```ShellSession
+nix-shell -p elmPackages.elm elmPackages.elm-format
+```
+
+To update the Elm compiler, see `nixpkgs/pkgs/development/compilers/elm/README.md`.
+
+To package Elm applications, [read about elm2nix](https://github.com/hercules-ci/elm2nix#elm2nix).