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/demoit/default.nix

@@ -0,0 +1,25 @@
+{ lib
+, buildGoModule
+, fetchFromGitHub
+}:
+
+buildGoModule {
+  pname = "demoit";
+  version = "unstable-2020-06-11";
+
+  src = fetchFromGitHub {
+    owner = "dgageot";
+    repo = "demoit";
+    rev = "5762b169e7f2fc18913874bf52323ffbb906ce84";
+    sha256 = "1jcjqr758d29h3y9ajvzhy1xmxfix5mwhylz6jwhy5nmk28bjzx9";
+  };
+  vendorSha256 = null;
+  subPackages = [ "." ];
+
+  meta = with lib; {
+    description = "Live coding demos without Context Switching";
+    homepage = "https://github.com/dgageot/demoit";
+    license = licenses.asl20;
+    maintainers = [ maintainers.freezeboy ];
+  };
+}