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/development/idris-modules/build-builtin-package.nix

@@ -0,0 +1,25 @@
+# Build one of the packages that comes with idris
+# pname: The pname of the package
+# deps: The dependencies of the package
+{ idris, build-idris-package }: pname: deps:
+let
+  inherit (builtins.parseDrvName idris.name) version;
+in
+build-idris-package {
+
+  inherit pname version;
+  inherit (idris) src;
+
+  noPrelude = true;
+  noBase = true;
+
+  idrisDeps = deps;
+
+  postUnpack = ''
+    sourceRoot=$sourceRoot/libs/${pname}
+  '';
+
+  meta = idris.meta // {
+    description = "${pname} builtin Idris library";
+  };
+}